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我们天天都要和称打交道，买东西要用称称。称分别有手称、台称、大到电子称，小到天秤。电子称能称上百吨的东西，但在古时没有很大的称时，要称很重的东西毫无办法了，可是三国时，曹操的儿子曹冲，小小年纪，能想出办法称出大象的重量，难能可贵，他的聪明才智，一直在人民心中流传千古。可是有谁见过能称地球的“怪人”吗？确有其人，请看《小学生之友》称地球的“怪人”。 We have to deal with scales every day. We need to use scales when shopping. The scales are hand scale, platform scale, electronic scale and Libra scale. The electronic scale can weigh hundreds of tons of things, but there is no way to weigh heavy things when there is no big scale in ancient times. But in the Three Kingdoms, Cao Chong, Cao Cao's son, was young and could figure out a way to weigh the elephant. His intelligence and wisdom have been flowing through the hearts of the people for thousands of years. But has anyone ever seen a "freak" who can call the earth? It's a real person. Please see what friends of primary school call the "strange person" of the earth. 要说称地球的怪人是英国着名的物理学家卡文迪许，他利用一根木棍和两个像哑铃的铅球，再用石英丝把两个铅球横吊起来，在地球的引力作用下，铅球发生摆动，石英丝扭动就能计算出地球的质量，在实验中由于铅球的引力太微弱，实验失败而告终。但卡文迪许在困难面前并没放弃，他像牛顿、爱迪生一样选择了坚强，他没灰心丧气，只知道研究苦苦思索，观察事物。他在走路时，偶然发现一个小孩在路边玩镜子，那太阳光影反射启发了他，他迫不及待在实验室里夜以继日开始长达50多年的实验，功夫不负有心人，终于在1798年按照万有引力的公式计算出地球的重量为60万亿亿吨。为称地球他由一个英俊的青年小伙子变成了一个白发苍苍的老年人。他为了真理，为了创造，为了科学研究，花了人生青春年华也在所不计。 | 
