The molecules bounce off each other like two colliding billiard balls.当分子相互弹开时就象两个碰撞的弹球.A billiard - table must be perfectly even.台球桌必须十分平.The billiard ball travelled gently across the table.台球慢慢地滚过台面....
Megamalls and fast food restaurants line the highway system.公路系统沿线有大型商场和快餐店。The regions are interconnected by an excellent highway system.那些地区通过完善的公路系统相互连接。Chris crawled on his hands and knees out onto the highway.克里斯手脚并...