Select an object you want to make dynamic.
选择对象要进行动态。
Users can also search for objects and select an object from the search results.
用户还可以搜索对象并从搜索结果中选择对象。
Depending on the state of the program, a mouse down might start drawing a line, or it might select an object.
根据程序的状态，鼠标按下事件，应该开始绘制一条直线，或者选中一个对象。
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