在两个小时中，他们反复听了3000遍，之后他们就可以在测试中准确地分辨出80％的心脏跳动声，相比听力练习前提高了30％。
About two hours and 3,000 playbacks later, the students were able to correctly identify 80 % of the heart sounds on a test—up from 30 % before the practice listening session.
虽然没有一丝微风，海面也没有一点波浪，但那轰隆声却如此巨大，以致我的心脏快承受不住，要停止跳动了。
Although not even a silent wind blew, and not even a small wave was seen on the sea, the booming was so mighty, that my heart threatened to stop beating.
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