Every human being is made up of many atoms (原子). All these atoms have a lot of empty (空的) space inside them. In fact, over 99.9 percent of each atom is empty. So if we take out all the empty space, the human body would be very small. The entire human race could fit in a sugar cube (盒子)!
英文二十一世纪(北京)教育传媒发展中心版权所有,未经书面授权,禁止转载或建立镜像。 主办单位:中国日报社 Copyright by 21st Century English Education Media All Rights Reserved 版权所有 复制必究 网站信息网络传播视听节目许可证0108263 京ICP备13028878号-12京公网安备 11010502033664号