... door cam switch 门碰铁开关，门限位开关 door close button 关门按钮 door close limit 关门限位 ...
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电梯的关门按钮真的是毫无用处的吗？
Is it true that the elevator close-door button is completely useless?
电梯里的关门按钮常常起心理安慰作用，好让那些连10秒钟都觉得漫长难捱的乘梯人分散注意力。
The door-close button in elevators, so often a placebo used to distract riders to whom ten seconds seems an eternity.
只有美国消防员和维修人员有密码或者特殊的钥匙时，他们才能按按钮加速关门的过程。
Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.
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