As t increases, this angle increases and the particle goes round and round.

随着 t 的增加,这个角度也在增大,这个质点不停地转圈

耶鲁公开课 - 基础物理课程节选

And this dimple is later forming a vesicle, a round ball, that goes on and forms the ear.

随后形成一个圆球状的泡囊，直至发育成耳朵。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选