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人们从实践中知道 ,使用轮子滚动比使物体滑动省力 .所以在工程中 ,为了提高效率 ,减轻劳动强度 ,常利用物体的滚动代替滑动 .古代人们就利用滚动来搬运物体 ,早在殷商时代 ,我国人民就利用车子作为运输工具 .据传 ,古埃及人在修建金字塔时 ,就是用滚木将巨大的石料从采石场运
People know from practice that the use of wheel rolling is more efficient than sliding objects. Therefore, in order to increase efficiency and reduce labor intensity, the project often uses the rolling of objects instead of sliding. Ancient people used rolling to transport objects as early as the age of Shang Dynasty. The people of our country use the car as a means of transport. It is rumored that when the ancient Egyptians built the pyramid, they used huge amounts of logs to transport huge stones from the quarry.