当人们第一次在显微镜下看到冠状病毒时，他们发现它的刺突使它看起来像一个皇冠。

When people first saw a corona-virus under a microscope, they found that its spikes made it look like a crown.

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在这段时间内(至少2 - 3小时)保证不要去查看邮件，不发信息，不上网，不打电话，没有来客突访，等等。

You need serious blocks of time (2-3 hours minimum) with no email checking, no instant messaging, no web surfing, no phone calls, no drop-in visitors, etc.

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但据奥尔森先生说，阿姆斯特朗可能是无意识地突来灵感，诗意生发而脱口道出了这一绝句，瑕不掩瑜——那一时刻才是完美的。

But according to Mr Olsson - Armstrong may have subconsciously drawn from his poetic instincts to utter a phrase that, far from being incorrect - was perfect for the moment.

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When an action potential comes down this pre-synaptic axon, when it reaches this point here, it sets off the process of these vesicles dumping their content into the synaptic cleft.

当动作电位到达轴突的突触前膜时,当到达这一点时 小泡就将其内含物,排放到突触间隙中去

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This process, which is shown schematically here, as a vesicle fusing with the cell membrane and then dropping its neurotransmitter only happens when an action potential reaches the end of the axon.

这一过程 扼要地展示在这里,小泡同细胞膜融合,释放其神经递质,这只发生在动作电位抵达轴突末梢时

耶鲁公开课 - 生物医学工程探索课程节选