有趣的人体“尺子”

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文具盒里有尺子,我们身上也藏着很多“尺子”.手就是一把尺子,它可以测量较短物体的长度,我的一拃大约长15厘米,电脑桌的长有6拃,它的长大约为15 × 6=90(厘米),茶几的长有9拃,它的长度大约就是15 × 9=135(厘米)=1.35米.
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