001先有轮子,后有车辆在远古时代,不仅没有任何车辆,连轮子也没有。那时的人类祖先,也就能拿块石头和木棍去追赶猎物。但当很幸运地猎到大象等体重较大的动物时,要想搬运回到山洞中,就是件非常难的事情。这时不知是哪位聪明的祖先就发明了用原木运输重物的方法。将要运输的重物放在木排上,木排下面垫上可以滚动的原木,然后就可拉动木排慢慢前进。 001 first wheel, after the vehicle in ancient times, not only did not have any vehicles, even the wheels did not. The human ancestors of that time will also be able to pick up stones and sticks to pursue their prey. However, when it is lucky to hunt large animals such as elephants, it is very difficult to move back to the cave. At this moment, I do not know which intelligent ancestor invented the method of transporting heavy objects with logs. The heavy objects to be transported are placed on the raft which can be rolled on the underside of the raft and then the racks can be slowly moved forward.