A progress bar can set expectations for the length of process, give a preview of the overall process, and keep users informed about how far they've progressed in the prescribed flow.
进度条可以让用户预估整个流程的长度，对于全部流程有个预览，并时刻告诉他们在整个流程中已经完成多少了。
A quantum state is a vector whose overall length is of no interest to us (as long as it's not zero).
量子态是向量，我们并不关心其总长度(只要不是0)。
For immediate relief with your current shoes, try adding a flat over-the-counter insole underneath your sockliner to make the fit narrower without affecting the overall length.
要让你现在的鞋子马上改善，试着在鞋垫下面塞一片平坦的东西来让鞋子变窄，但不要影响它的长度。
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