The father answered: "Your brothers have hurt themselves with it, leave it alone, you do not understand anything about it."

父亲回答说：“你的哥哥们都受了伤，你别去了，你一点也不会砍柴。”

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Most people do not understand what a muscle cramp is, let alone understand why it happens and how to prevent them.

多数人不明白什么是肌肉抽筋，那就让我们来了解为什么会出现这个现象并如何避免其发生。

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Only when I be alone, I would give vent to my heart out all the emotion, I do not understand myself more and more.

只有当自己一个人时，才会把心中的情感尽情宣泄出来，我越来越不了解自己了。

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EHW's ability to adapt automatically means that it can exploit the physics of materials in ways that researchers do not even consider, let alone understand.

ECONOMIST: REPORT: EVOLVABLE HARDWARE

D. level climate scientists that work at Columbia University's Earth Institute and even if you do not understand the physics of climate change or the computer models predicting global warming, common sense alone might lead you to think that human beings and their machines are making the planet warmer.

CNN: Why we should expect more weather disasters