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.

youdao

youdao

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.

youdao

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