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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。

麻省理工公开课 - 计算机科学及编程导论课程节选

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。

麻省理工公开课 - 热力学与动力学课程节选

The airline said the strike, the second in two months, was uncalled for.

BBC: Lufthansa strike causes flight cancellations

Hossa had two goals and Patrick Sharp scored in regulation for the second time in two games for the Blackhawks, who have won seven of eight overall.

NPR: Blackhawks Match Record For Opening Point Streak

Last week's order to ground the planes - in the US air force, army and Marine Corps - marked the second time in two months planes from the F-35 range have been grounded.

BBC: Grounded US F-35 fighter jet fleet to resume flights