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习近平同巴西联邦共和国总统举行会谈 两国元首一致同意推动中巴全面战略伙伴关系取得新的更大发展******  央视网消息(新闻联播):国家主席习近平1日下午在人民大会堂东门外广场举行仪式,欢迎巴西联邦共和国总统米歇尔·特梅尔对我国进行国事访问。

  中共中央政治局委员、中央政策研究室主任王沪宁,中共中央政治局委员、中央书记处书记、中央办公厅主任栗战书,全国人大常委会副委员长王晨,国务委员杨洁篪,全国政协副主席张庆黎等出席欢迎仪式。

  陪同特梅尔访华的有外交部长、驻华大使、交通、港口和民航部长、农业、渔业和供给部长等。

  军乐团奏巴中两国国歌。鸣礼炮21响。

  特梅尔在习近平陪同下检阅中国人民解放军三军仪仗队。

  两国元首回到检阅台观看仪仗队分列式。

  随后,军乐团进行行进吹奏表演。

  特梅尔是应习近平的邀请对我国进行国事访问的,特梅尔还将出席金砖国家领导人厦门会晤和新兴市场国家与发展中国家对话会。

  欢迎仪式后,习近平主席在人民大会堂同特梅尔总统举行会谈。两国元首一致同意深化中巴传统友谊,推动中巴全面战略伙伴关系取得新的更大发展。

  习近平指出,中国和巴西分别是东西半球最大发展中国家,都是重要新兴市场国家。中巴关系是成熟而稳健的发展中大国关系。过去一年,中巴合作稳中有进,贸易、投资、金融“三驾马车”呈现并驾齐驱的良好局面。两国合作机制运转顺畅,双方就金砖国家合作以及重大全球性热点问题保持卓有成效的沟通和协调。

  习近平强调,中方始终从战略高度和全局角度看待和发展同巴西关系,赞赏巴方长期坚持一个中国原则,愿与巴方继续在涉及彼此核心利益和重大关切问题上相互理解和支持。双方要发挥中国-巴西高层协调与合作委员会等机制作用,统筹推进各领域交流合作,积极探讨“一带一路”倡议同巴西“投资伙伴计划”“前进计划”对接,促进地区互联互通和联动发展。双方要促进贸易畅通,推动双边贸易持续稳定增长。要深化中巴基础设施建设、制造业、农业、矿业、能源、产能和科技创新合作。要扩大文化、新闻、旅游、体育等领域交流合作。双方要密切在联合国、二十国集团、基础四国、世界贸易组织等多边框架内合作,就全球经济治理、可持续发展等重大国际问题协调配合。

  习近平指出,10年来,金砖国家开辟出一条平等互利、合作共赢的新路子,取得了一批实实在在的成果。中方愿同巴方一道努力,推动金砖国家经济合作、政治安全、人文交流“三个轮子”一起转,开启金砖合作第二个“金色十年”。

  习近平强调,中方坚定支持拉美联合自强、发展振兴,致力于构建携手发展的中拉命运共同体。中方对同南方共同市场合作持积极和开放态度,愿提升中国与南方共同市场合作水平。

  特梅尔表示,巴中亲密友好,巴西高度重视发展两国全面战略伙伴关系,是伟大中国的可靠伙伴。巴方愿在国家改革发展进程中加强同中方贸易、投资、金融、农业等全方位互利合作,扩大人文、旅游、体育交流,增进两国人民相互了解和友谊。巴中双方在联合国、二十国集团、世界贸易组织等多边框架内立场相近,就气候变化、发展等全球性问题保持密切沟通协调。巴方全力支持中方办好金砖国家领导人厦门会晤,愿同中方携手推动金砖国家和发展中国家加强团结合作。

  会谈后,两国元首共同见证了产能、电子商务、质检、电力、旅游、卫生、融资、文化体育等领域共10多项双边合作文件的签署。

  王沪宁、栗战书、杨洁篪等参加上述活动。

Mena grabs brace as Leon edge toward Liga MX title******

MEXICO CITY, Dec. 9 (Xinhua) -- Ecuadorian winger Angel Mena scored two late goals as Leon clinched a 3-2 home win over Atlas in the first leg of the Liga MX Apertura final on Thursday.。

Luis Reyes put the visitors ahead with an 11th-minute strike before Victor Davila equalized with a left-footed shot after Jean Meneses' headed pass.。

Argentine striker Julio Furch restored Atlas' lead with a cool finish just after the hour mark before Mena put the hosts back on level terms by slotting a low effort past goalkeeper Camilo Vargas in the 78th minute.。

Mena prompted jubilant celebrations from the home fans when he converted an 86th-minute penalty after Aldo Rocha brought down Victor Davila.。

The decisive second leg will be played at Atlas' Jalisco stadium in Guadalajara on Sunday. Enditem。

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Canada finds first cases of COVID******

Canada has found the first cases of COVID-19 in three white-tailed deer, according to the Environment and Climate Change Canada on Wednesday.。

On Monday, the National Centre for Foreign Animal Disease confirmed the first detections of SARS-CoV-2 in three free-ranging white-tailed deer in Canada.。

These deer were sampled between November 6 to 8 this year, in the Estrie region of Quebec. Samples for SARS-CoV-2 were collected through a big-game registration station in southern Quebec. Similar to findings in the United States, the deer showed no evidence of clinical signs of disease and were all apparently healthy. The World Organization for Animal Health was notified on Wednesday.。

"As this is the first detection of SARS-CoV-2 in wildlife in Canada, information on the impacts and spread of the virus in wild deer populations is currently limited," said the Environment and Climate Change Canada said in a press release.。

This finding emphasizes the importance of ongoing surveillance for SARS-CoV-2 in wildlife to increase understanding about SARS-CoV-2 on the human-animal interface, said the press release.。

The Environment and Climate Change Canada calls for added precaution like wearing a well-fitted mask when exposed to "respiratory tissues and fluids from deer."

The virus has been found in multiple animal species globally including farmed mink, cats, dogs, ferrets, and zoo animals such as tigers, lions, gorillas, cougars, otters and others.。

"Recent reports in the United States have revealed evidence of spillover of SARS-CoV-2 from humans to wild white-tailed deer, with subsequent spread of the virus among deer. There has been no known transmission of SARS-CoV-2 from deer to humans at this time," the press release added.。

双语热点:世上首个活体机器人 如今可自我繁殖******

数十亿年来,生物体为了延续生命,已经进化出多种繁衍方式。近日,美国佛蒙特大学和塔夫茨大学的研究团队发现了一种全新的生物繁殖方式,并利用这一发现创造了有史以来第一个可自我繁殖的活体机器人——Xenobots 3.0,未来或可为外伤、先天缺陷、癌症、衰老等提供更直接、更个性化的药物治疗。

World's first living robots can now reproduce, scientists say

The US scientists who created the first living robots say the life forms, known as xenobots, can now reproduce -- and in a way not seen in plants and animals.

创造第一个活体机器人的美国科学家说,这种被称为“爪蟾机器人”(xenobots)的生命体,现已可以繁殖——以一种与植物和动物都不同的方式。

Formed from the stem cells of the African clawed frog (Xenopus laevis) from which it takes its name, xenobots are less than a millimeter (0.04 inches) wide. The tiny blobs were first unveiled in 2020 after experiments showed that they could move, work together in groups and self-heal.

“爪蟾机器人”由非洲爪蟾(Xenopus laevis)的干细胞组成,它的名字由此而来,其宽度不到一毫米。在实验表明它们可以移动、集体合作和自我修复后,这些微团型机器人于2020年首次亮相。

Now the scientists that developed them at the University of Vermont, Tufts University and Harvard University's Wyss Institute for Biologically Inspired Engineering said they have discovered an entirely new form of biological reproduction different from any animal or plant known to science.

现在,创造这些“爪蟾机器人”的佛蒙特大学、塔夫茨大学和哈佛大学怀斯生物启发工程研究所的科学家表示,他们发现了一种全新的生物繁殖形式,不同于科学上已知的任何动物或植物。

"I was astounded by it," said Michael Levin, a professor of biology and director of the Allen Discovery Center at Tufts University who was co-lead author of the new research.

共同主导这项新研究的科学家,塔夫茨大学生物学教授兼艾伦探索中心主任迈克尔·莱文(Michael Levin)说:“我对此感到震惊。”

"Frogs have a way of reproducing that they normally use but when you ... liberate (the cells) from the rest of the embryo and you give them a chance to figure out how to be in a new environment, not only do they figure out a new way to move, but they also figure out apparently a new way to reproduce."

“青蛙有一种它们通常使用的繁殖方式,但是当你……从胚胎的其余部分释放(细胞),你给它们一个机会去弄清楚如何在一个新环境中生存,它们不仅会找到一种新的移动方式,而且它们显然也发展出了一种新的繁殖方式。”

Robot or organism?

是机器人还是生物?

Stem cells are unspecialized cells that have the ability to develop into different cell types. To make the xenobots, the researchers scraped living stem cells from frog embryos and left them to incubate. There's no manipulation of genes involved.

干细胞是具有发育成不同细胞类型的能力的非特化细胞。为了制造“爪蟾机器人”,研究人员从青蛙胚胎中提取了活干细胞,并让它们孵化。过程中不涉及基因操纵。

"Most people think of robots as made of metals and ceramics but it's not so much what a robot is made from but what it does, which is act on its own on behalf of people," said Josh Bongard, a computer science professor and robotics expert at the University of Vermont and lead author of the study, "In that way it's a robot but it's also clearly an organism made from genetically unmodified frog cell."

“大多数人会认为机器人是由金属和陶瓷制成的,但与其讨论机器人是由什么制成的,不如讨论它的作用是什么,它代表人类的自主行动。”佛蒙特大学电脑科学教授和机器人专家,也是该研究主要作者的乔西·邦加德(Josh Bongard)说:“从这个意义上说,它是一个机器人,但它显然也是一个由未经基因改造的青蛙细胞制成的有机体。”

Bongard said they found that the xenobots, which were initially sphere-shaped and made from around 3,000 cells, could replicate. But it happened rarely and only in specific circumstances. The xenobots used "kinetic replication" -- a process that is known to occur at the molecular level but has never been observed before at the scale of whole cells or organisms, Bongard said.

邦加德说,他们发现,最初是球形、由大约3000个细胞组成的“爪蟾机器人”,可以自我复制。但这很罕见,而且只在特定情况下发生。他说,“爪蟾机器人”使用了“动力学复制”——这一过程已知发生在分子水平,但以前从未在整个细胞或生物体的规模上观察到过。

With the help of artificial intelligence, the researchers then tested billions of body shapes to make the xenobots more effective at this type of replication. The supercomputer came up with a C-shape that resembled Pac-Man, the 1980s video game. They found it was able to find tiny stem cells in a petri dish, gather hundreds of them inside its mouth, and a few days later the bundle of cells became new xenobots.

在人工智能的帮助下,研究人员随后测试了数十亿种体型,以使“爪蟾机器人”在这种类型的复制中更有效。这台超级电脑最终设计出了一个类似于80年代电子游戏中吃豆人(Pac-Man)的C形状。他们发现,它能够在培养皿中找到微小的干细胞,将数百个干细胞聚集到它的嘴里,几天后,这束细胞变成了新的“爪蟾机器人”。

"The AI didn't program these machines in the way we usually think about writing code. It shaped and sculpted and came up with this Pac-Man shape," Bongard said.

"人工智能并没有按照我们通常认为的编写代码方式,对这些机器进行编程。它塑造和雕刻并发展了这种吃豆人形状。"

"The shape is, in essence, the program. The shape influences how the xenobots behave to amplify this incredibly surprising process."

邦加德说:“从本质上来说,形状就是程序。形状会影响‘爪蟾机器人’的行为,以放大这一令人难以置信、令人惊讶的过程。”

The xenobots are very early technology -- think of a 1940s computer -- and don't yet have any practical applications. However, this combination of molecular biology and artificial intelligence could potentially be used in a host of tasks in the body and the environment, according to the researchers. This may include things like collecting microplastics in the oceans, inspecting root systems and regenerative medicine.

“爪蟾机器人”仍处于非常早期的技术——就像40年代的电脑——还没有任何实际应用。然而,研究人员表示,这种分子生物学和人工智能的结合,有可能用于身体和环境中的许多任务。这可能包括收集海洋中的微塑料、检查根系和再生医学等。

While the prospect of self-replicating biotechnology could spark concern, the researchers said that the living machines were entirely contained in a lab and easily extinguished, as they are biodegradable and regulated by ethics experts.

虽然自我复制生物技术的前景可能会引起人们的担忧,但研究人员表示,这些活体机器人完全控制在实验室中,很容易销毁,因为它们是可生物降解的,并受到伦理专家的监管。

"There are many things that are possible if we take advantage of this kind of plasticity and ability of cells to solve problems," Bongard said. The study was published in the peer-reviewed scientific journal PNAS on Monday.

邦加德说:“如果我们利用细胞的这种可塑性和解决问题的能力,有很多事情会变得可能。”该研究于周一发表在受同行评审的科学期刊《美国国家科学院院刊》。

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