底摆边高就是底边到折边的宽度。
The hem allowance is the width between the hemline and the hem edge.
纬度同样是从拉丁语而来，是指横向，从一边到另一边的宽度。
Latitude is also from Latin and is related to "lateral" that is from side to side and refers to the width.
我们可以把长城看作是一对线耦来测得分辨率，比如说把长城当作一条线来分辨，那么这条线两边都要以长城同等的宽度来分辨。
To measure resolution, consider a line pair -> i.e. the wall is a line but to differentiate it, there must be a contrasting equal width along side.
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