约束布局

constrainedly───adv.勉强地；强迫地；不自然地

constant battle───不停的战斗

constant danger───固定火险性

constant dialogue───持续对话

constant flux───恒定磁通

constant pain───持续的疼痛

constant threat───持续的威胁

But more importantly, the label is positioned by passing its layout constraint to the parent.───但更为重要的是，该标签是通过将其布局约束传递给父元素来定位的。

This layout USES a Rectangle constraint to determine where to place the children figures.───该布局使用Rectangle约束来确定在何处放置子图形。

You need to add only a single constraint and you have a valid layout again.───你只需要再增加一个约束，就又产生一个有效布局。