影子时钟(Shadow Clock)就是一个LED灯，内部的金属片将影子投影在墙上，随着时钟的影子，你就可以看到一个时钟，包含时针，分针和秒针。
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Shadow Clock Tower 钟楼阴影
shadow clock
影子时钟
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The gaffes surrounding such debates have become part of the folklore of American presidential elections ever since Richard Nixon's five o'clock shadow is said to have lost him the 1960 presidential race.
ECONOMIST: TV debates
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