But I was convinced I'd hear the click-click-click-click-click which is what tells you you're in trouble.
我总会觉得很紧张,我不知道这是为什么,虽然我从来没有接触过放射元素。
The third derivative, unfortunately, was never given a name, and I don't know why.
遗憾的是三阶导数没有专门的名称,我也不知道这是为什么
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