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？

youdao

I frantically pressed the 'close door' button but had to move the shot man's foot for the doors to close, " he said.

我疯狂地摁着“关门”的按钮，但是必须把受伤的男人的脚挪开才能让门关上。” 他说。

youdao

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。

youdao

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