Toggles the 'frame stack' window, which displays the stack of visible frames under the mouse pointer. (There are also key bindings for this).

切换“窗口堆栈”窗口， 该窗口指代当前鼠标指针下的可见窗口。（这个功能也有一些按键绑定）

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Notice that the word 'Print' now is floating under your mouse pointer.

注意，现在单词“打印”将浮动在鼠标指针下方。

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If the object under the mouse pointer is already selected, this property promotes the object to be the primary selection object.

如果已选定鼠标指针下的对象，则此属性会把对象提升为主选择对象。

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