需求图、参数图以及分配图是UML中所没有的新图。

Requirements, Parametrics, and Allocations are new diagrams not available in UML.

youdao

在开始画新图前，要先清除之前的图片，这一点很重要。

It is important to clear the previous graphic before a new graphic is drawn.

youdao

否则，新图就会呈现在旧图的上面，如此重叠画图最终会降低处理的速度。

Otherwise, the new drawing will be rendered on top of the older drawing, which will eventually slow down the process because of redrawing over the top of each other.

youdao