From 1983 to the present as you just said, the economy has a long period of smooth, robust expansion interrupted by two very mild recessions.

第二时期是从1983年至今，正如你所说，经济长时间处于,平稳强健的发展状态,而只出现了两次轻度衰退。

斯坦福公开课 - 经济学课程节选

The "Why don't" pattern is a very polite, very smooth way to suggest something.

Why don't”句型是一种非常礼貌、流畅地提出建议的方式。

Why don't 课堂 - SpeakingMax英语口语达人

You could take a continuous path, where you have an infinite equilibrium points in between the two, a smooth path, whereyoudrop pressureand temperature simultaneosly in little increments.

你可以选择光滑的连续路径，在初末态间有,无数个平衡态的点，压强和温度同时一点,一点地下降。

麻省理工公开课 - 热力学与动力学课程节选

They like to hear the music of a smooth voice and so on.

婴儿们喜欢听到拥有平缓声音的音乐等等

耶鲁公开课 - 心理学导论课程节选

So if there's any systematic bias going on in the way these things get graded it'll smooth itself out across the teaching fellows, so we'll have a fair grading system and things.

所以,如果在评分过程中,有任何系统性误差,都会由助教们尽量纠正过来,这样就有了公平的评分系统

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Somehow, if you could manufacture a really smooth frictionless surface, that if you took a hockey puck or something and an air cushion and you give it a push, in some idealized world, it'll travel forever.

如果你制造一个绝对光滑无摩擦的表面,然后在上面放个冰球或者别的什么,或者气垫,然后推它一下,在理想条件下,它会永远运动下去

耶鲁公开课 - 基础物理课程节选

You've got to spend the time to make sure that everything is well defined before you start trying to work out these problem More about the path. There are a couple ways you could go through that pass If I look at this smooth path here.

你要花时间确认,在你开始尝试解题前,切已经被很好地定义,关于路径还有些问题,你可以用两种不同的方式经过这条路径,看这条平滑的路径。

麻省理工公开课 - 热力学与动力学课程节选