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But vaccines, and particularly in the last hundred years, vaccines have been one of the most important elements in our progress.
但是疫苗,尤其是在近一百年来,疫苗已经成为,感染性疾病防治进程中最重要的一环
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There's water on all sides, so going to the beach if it's sunny.
公园四面环水，所以天气晴朗时可以去海边。
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Milton had written in Areopagitica that he had actually met Galileo on his journey, when Milton was a young man and Galileo was a very old man, through the continent.
弥尔顿在中已经写到,他实际上在旅途中曾经遇到过伽利略，那还是当他是一个年轻人，而伽利略已然老去的，一次环陆旅行中。
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Benzene is a ring that's made up of six carbon atoms and six hydrogen atoms.
苯环是一个由六个碳原子,和六个氢原子组成的环。
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And orbiting around this is a lone electron out at some distance r.
有一个单电子,在环原子核的轨道上运行。
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Today, they're a very important part of the fund's management framework.
如今,对冲基金是,基金管理体系的重要一环
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I mean, they're surrounded by water everywhere you look.
我是意思是,那儿四面环水
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But it was an important ambient.
这也是一个很重要的一环。
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And theother way in the circle will never happen.
这个环中的另一个方向永远不会发生。
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You can say to them as you're sitting around, your birthday dinner, toasting "I'm glad to be with you."
当你们环桌而坐参加你的生日晚宴时，你可以举杯对他们说“I'm glad to be with you.”
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It wouldn't be the same if I turned it upside down because the carbons - the rings here, the pentose's would all be turned over, the chemistry would look different and the sequence of bases would look different.
记住单链倒过来,就和原来不一样了,这是因为碳原子和糖环结构,戊糖会翻转,使得这个化学结构看起来不一样了,碱基的顺序也不一样了
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They want to get as far away from each other possible, the ideal angle is 120. But what we have here is a four-membered ring, so what angle does 90° that have to be, that bond? 90 degrees.
它们想要尽量远离彼此，最理想的是形成120°键角,但现在是个四元环,所以这键角应该多大？
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So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.
现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。
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