When a user clicks inside of the Action Bar, the applet intercepts that click and figures out which button the user's mouse is over, given its boundaries.

当用户在Action Bar中点击时，applet拦截此响应并指出用户点击了哪个按钮，给出它的边界。

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If you're with a group of coworkers or guests, it's considered polite to press and hold the "door open" button until everyone else is inside/outside the elevator, then let yourself in/out last.

如果你和一群同事或者客人一起乘电梯，按住住“开门”的按钮直到每个人都进入或离开电梯是一种基本礼仪。

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