圆盘产生自己的引力拖曳，这种相互作用的力夺走了行 星在其轨道上的动量，迫使它盘旋向恒星的方向。

The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star.

youdao

讨论过渡小泡以及顺行和逆行转运的作用。

Discuss the role of transition vesicles, and anterograde and retrograde transports.

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根据惯例，过滤器对文本的行起作用。

By convention, filters work on lines of text.

youdao

I'm simply saying swap X with Y, but this 2 won't work, because where are X and Y defined?

我只简单地说交换X和Y，但是这两行不起作用，因为X和Y是在哪里定义的呢？

哈佛公开课 - 计算机科学课程节选