And,they believed T.rex could eat up to two hundred thirty kilograms of meat in one bite.

VOA: special.2009.09.01

And all this is, is saying that when you take a mixed second derivative, it doesn't matter in which order you take the two derivatives.

麦克斯韦关系的本质是,当你考虑混合的二阶导数时，求导的顺序不影响最后的结果,现在，我们利用这些关系。

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Let me rewind slightly in the story so that I don't actually mislead because I forgot to update these two cells.

我们先倒回去一点,我没有误导，因为我忘记了,更新这两个单元。

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"The problem we're in today was caused by things we've done in the last two years, in particular engaging in two wars that haven't been paid for in any way, shape or form -- as well as the fact that we've had a significant drop in revenues partly as a result of our changes in the tax laws, " he said.

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He conflates what were two expeditions to Darien into one ("You can't have two climaxes in a novel, " is his sensible excuse).

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"Like lots of 20-somethings their days didn't begin until two in the afternoon, " he smiled.

BBC: Michael Mortiz