The returned value is then stored in an undo command so that the model can be restored easily by calling addElement() again.

然后，将返回值存储到一个撤销命令中，这样就能通过再次调用 addElement()轻松地恢复该模型。

youdao

The returned value is then stored in an undo command so that the model can be restored easily by calling addElement() again.

然后，将返回值存储到一个撤销命令中，这样就能通过再次调用 addElement()轻松地恢复该模型。

youdao