Pan Am is the second airline in two months to file for bankruptcy.
泛美航空公司是两个月内第二家申请破产的航空公司。
It was the second air disaster in the region in less than two months.
这是不到两个月内该地区内的第2起空难。
However, they industrialized rapidly in the second half of the century, especially in the last two or three decades.
然而,它们在下半世纪迅速工业化,特别是在过去二、三十年。
The volcanic eruption was the second time in two years that Iceland has shaken its neighbors to the east.
VOA: special.2010.04.23
STUDENT: Right, we're going to do that in a second, but the answer is Fibonacci numbers, we define the first two.
学生:听不见:,我们马上会试一试,但是答案是斐波那契数列,我们可以定义下最初的两个数。
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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