Is it true that the elevator close-door button is completely useless?

电梯的关门按钮真的是毫无用处的吗？

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The door-close button in elevators, so often a placebo used to distract riders to whom ten seconds seems an eternity.

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。

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Close the landing door of the top floor, press the up or down button, check if they work well.

关闭顶层厅门，在轿顶点动操作上下行按钮，注意电梯运行方向，要与动作的按钮方向一致。

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Clarke have popularized the idea of a space elevator, there are still a few kinks that need to be worked out before we start having folks hit the "door close" button for a 100, 000 kilometer (62, 000 miles) ride.

ENGADGET: Space elevator ride may kill humans due to ionizing radiation