英语问题foldinonitself这个是短语么?如果是,应该不是字面上的意思我猜想是‘结束’，但不确定。Usinghigh-speedvideography,scientistsobservedsurfacebubblesastheyburst.Andtheysawthatwhentheskinoftheb

Question

英语问题fold in on itself
这个是短语么?如果是,
应该不是字面上的意思 我猜想是‘结束’，但不确定。
Using high-speed videography,scientists observed surface bubbles as they burst.And they saw that when the skin of the bubble ruptures,it retracts.As this film folds in on itself,it can trap air,thus forming smaller,daughter bubbles.所以肯定不是什么折叠吧

Answer 1

有完整的句子么?是在说自行车么?
fold in 是卷起来,折叠的意思
fold in on itself,就是能够自行折叠