这种限制不会阻止您再次单击该按钮时执行代码；仅仅是看不到代码。
This limitation does not prevent their execution when you next click the button; it just prevents you from seeing the code.
单选按钮适合于显示所有可能的选择并将选择限制为单个值。
Radio buttons are good for displaying all possible choices and limiting the selection to a single value.
在工具栏上有一个过滤器按钮，可以限制显示的关系集。
There is a filter button on the toolbar to restrict the set of relationships that are shown.
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