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Chapter 单元 :

Standard 4 四年级，Measurements 测量

A thread can be used to measure the circumference of a round object. The tailor can use string to encircle clients bodies and make a mark on the string, then place the string along the length of a ruler and measure its length.

绳子可以取代皮尺来为顾客量身。裁缝可以先用绳子为顾客量身，然后在绳子上做记号，再以尺量有记号的绳子的长度，就可以完成量身的步骤。