苏联解体之后，繁殖系统被破坏，俄罗斯人已吃掉了大部分的肉牛。

After the collapse of the Soviet Union, Russians ate most of their beef cows as the system of reproduction broke down.

youdao

所有生物都有有限的生命周期所以繁殖后代非常重要。探究繁殖系统基本要素包括的各个生理器官(植物的和动物的)以及基因遗传。

All organisms have a finite life-span thus the need to procreate is Paramount. Explore the fundamental aspects of reproduction including physical organ (in plants and animals) and genetic inheritance.

youdao

病毒没有被杀死，所以它是活病毒，它会感染你的肠道系统并繁殖。

The virus is not killed so it's a live virus, which is actually going to infect your intestinal system and reproduce.

youdao

The virus is not killed so It's a live virus, which is actually going to infect your intestinal system and reproduce.

病毒没有被杀死,那么它就是活性病毒,也就意味着它将会,侵入你的肠道系统并且会繁殖

耶鲁公开课 - 生物医学工程探索课程节选

You could imagine that you've got virus that's propagating inside your cells, making more and more virus, your immune system really responds well to that.

你可以想象,病毒在你的体细胞内繁殖,数量越来越多,你的免疫系统对此反应非常之强烈

耶鲁公开课 - 生物医学工程探索课程节选

Because it infects your cells and reproduces, your immune system responds much more vigorously.

由于它会感染你的细胞并且繁殖,所以你的免疫系统会有很强烈的反应

耶鲁公开课 - 生物医学工程探索课程节选