此方法还可以解决不连续但是有相对位置约束的模块布局问题。
This method can also handle blocks with related position constraint but not connected.
您可以使用组合约束定位零件之间的相对位置。
You use assembly constraints to locate the parts with respect to one another.
二是采用图形元素间相对位置的约束来控制不同图形元素的相对位置，这样在选定一个参考图形元素后其他图形元素的位置也全部确定。
Second, use constraints to control the relative positions of the different graphic elements, as a graphic element is selected as reference, location of other graphic elements are all determined.
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