By the time you turn 70, your heart will have beat some two-and-a-half billion times (figuring on an average of 70 beats per minute.)

到70岁时，你的心脏已经跳动25亿次(假设平均每分钟跳动70次)。

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And so although I'll be saying a great deal about the Phaedo once we turn to it, I want to just take a minute or two and say a couple of introductory remarks.

尽管在讲到斐多篇时,我会向你们详尽介绍其中的内容,但现在,我还是想先花一两分钟的时间,做一个简短的引言

耶鲁公开课 - 死亡课程节选

After two minutes, turn on the middle switch and leave it on for one minute.

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