它还约束了视图相对于父视图的结束边界。
It also constrains the view's trailing edge relative to the superview's trailing edge.
结束边界的位置可以根据父视图的尺寸计算出来，其它约束也是。
The position of the trailing edge can then be calculated based on the superview's size and the other constraints.
然后，视图的宽度和结束边界位置都可以根据父视图的尺寸计算出来，其它约束也是。
Both the width and trailing edge's position can then be calculated based on the superview's size and the other constraints.
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