Push hard and fast. Aim for a rate of about one hundred compressions each minute.
VOA: special.2009.06.09
And I'm going to pause for a minute, before I run it, and ask each of you to compute in your head what you think the answer should be.
我将暂停一会儿,在我运行之前,我想问问你们你们,心算得出的答案应该是什么。
They each have about a half an hour or 45-minute lessons.
他们每个人都有大概一小时或四十五分钟的课。
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