有些测量是直接的，例如当我们求一张桌子的长度时是通过把码尺或米尺放到桌边量出来的。
Some measurements are direct, as when we find the length of a table by placing a yard or meter scale beside it.
有些测量是直接的，例如当我们求一张桌子的长度时是通过把码尺或米尺放到桌边量出来的。
Some measurements are direct, as when we find the length of a table by placing a yard or meter scale beside it.
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