Diagram 9 shows a tool to measure time.
图9显示一个测量时间的工具。
It USES a thin stream of falling sand to measure time.
它使用一小股落下的沙子来计算时间。
As hunters, people did not need a way to measure time.
作为狩猎者，人们不需要计量时间的方法。
When people began to count such events, they began to measure time.
当人们对这些事件开始计数时，他们就开始测量时间了。
An hourglass was an instrument used to measure time in ancient times.
漏刻是古代的计量时间的仪器。
Measure time to read a message.
测量读取消息所需的时间。
Measure time to read a message.
测量读取消息所需的时间。
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