过去和现在都有各种各样的轮子 碾石-齿轮-汽车轮子-机器部件 每天都不断的被使用和运用
轮子作为人类最重要的发明之一,在人类走向工业化、机械化社会的过程中,它起着杠杆的作用。
There are various wheels of the past and present.
mill stones - gears - car wheels - machine parts
Daily used and utilized
The wheel as one of the most important inventions of the mankind, basic stick on his way to an industrialized - mechanized society. |