“米”是长度的国际单位,它是物理学的七个基本单位之一。“米”这个单位是怎样定义的呢,我们知道要测量物体的长度,首先就要确定五个标准。但以前各国各地制定的测量长度的标准是不统一的。例如我国古代曾用张开的大拇指和中指之间距离作为“尺子”,爱看古典小学的人第一次阅读《三国演义》,会误认为书中的人物都是巨人,如关云长 The “meter” is the international unit of length. It is one of the seven basic units of physics. How does the “rice” unit be defined? We know that to measure the length of an object, we must first determine the five criteria. However, the standards for measurement lengths developed in various countries were not uniform. For example, in ancient China, the distance between the thumb and the middle finger was used as a “ruler.” Those who love to see a classical elementary school for the first time read “The Romance of the Three Kingdoms,” and mistakenly believe that the characters in the book are giants, such as Guan Yunchang.