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我们知道,钟表是计时器的一种。在钟表发明以前,我们的先辈已经开始利用各种方法来度量时间。比如:依据太阳光线的位置判断时间的日晷,使用沙子的流动记录
We know that the clock is a timer. Before the invention of timepieces, our ancestors had begun to use various methods to measure time. For example: according to the location of the sun to determine the time of day 使, the use of sand flow records