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20世纪80年代绿色运动的势头开始增强。

During the 1980s the green movement gathered momentum.

《牛津词典》

到了20世纪20年代，随着大众舞蹈运动的出现，人们聚在一起听钢棒吉他乐。

By the 1920s, with the advent of the public dance movement, people were gathering in large groups to listen to steel guitar music.

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The way the physics works is you will find some laws of motion in mathematical form, you put in the initial conditions of whatever, you solve the equations, and the answer that comes, you have no choice.

在物理问题中,你可以用数学方法得到运动定律,你代入初始条件,然后解方程,获得答案,你别无选择

耶鲁公开课 - 基础物理课程节选