近年来麻疹疫苗初种前小婴儿麻疹发病率呈上升趋势，以夏季度多见；

The attack rate of measles in little infants before primary vaccination increased in recent years, which reaches the top in summer and increases with the increasing of the month age.

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有一种很强大的初动力——比恒定状态时的力要大五倍。

There was a huge initial force—five times larger than the steady state force.

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为了应对广告的减少和街角销售的下滑，《纽约时报》打算在2011年初引进一种“计量”模型。

Struggling with an evaporation of advertising and a downward drift in street corner sales, The New York Times intends to introduce a "metered" model at the beginning of 2011.

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So, the first obvious one is to take V1 to V2 first with p constant. So take this path here.

从初态到末态可以有无数种路径2,甚至像这样，我们只研究两种。

麻省理工公开课 - 热力学与动力学课程节选