当鼠标单击时，用户能够且只能够选择一个选项。
With one mouse click, a user can choose one and only one option.
给移动到门户上的鼠标添加该选项，固定鼠标的当前位置。
Add the option to mouse over a portal to have it freeze its current position.
相反，鼠标移过菜单，移到选项，并单击。
Instead, you mouse over a menu, move to your option, and click it.
相反，鼠标移过菜单，移到选项，并单击。
Instead, you mouse over a menu, move to your option, and click it.
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