要移动、修改或者删除图形元素，该ID将作为参数传递给包含画布对象的各个成员函数。

To move, modify, or delete a graphics element, this ID is passed as a parameter to the respective member function on the containing Canvas object.

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所以，虽然您可以使用键盘删除字符，但还是要用图形按钮添加它们。

So, while you can use the keyboard to delete characters, use the graphical buttons to add them.

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应用程序可以将新的对象添加到图形中，从图形中删除对象并修改对象的属性。

Applications can add new objects to the graph, delete objects from the graph, and modify attributes of objects.

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