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人类在生活、生产和科学研究中都少不了要计量,要计量就得有计量单位,可是现在的计量单位也太多、太繁杂、太紊乱了。拿长度来说就有市尺、呎(英尺),公尺(米)……,质量有市斤、磅、公斤(仟克)……,容积有升、加仑、立方米……。市制在我国曾广泛使用,现在虽已废止,但民间还颇通用,英制(时、呎、磅……)在说英语的国家依然
Human beings need measurement in their daily life, production and scientific research. To measure, they must have a unit of measurement. However, there are too many units of measurement now. They are too complicated and too disorderly. In terms of length, there are city rulers, feet (feet), meters (meters) ... ... and masses of pounds, pounds, kilograms (kg) ... ... and volumes of gallons, cubic meters .... The municipal system was widely used in our country. Although it has now been abolished, the civil sector is still quite common. The English system (hour, foot, pound ...) is still in the English-speaking countries