中国是一个历史悠久的国家,几千年来,劳动人民勤劳智慧的经验的积累,已经为我们创造了不少有用的东西。在农业生产上,很早以前,我们的祖先就创造了进行耕作的器具,不过开始时很简单,往往是一根树枝,一棵木杆。当我们的社会由原始共产社会时代进化到奴隶社会时代以后,在黄河流域就有一种曲柄岐头的 China is a country with a long history. For thousands of years, the accumulation of industrious and industrious wisdom has created many useful things for us. In agricultural production, long ago, our ancestors created the implements for farming, but at first it was very simple, often a branch, a wooden pole. When our society evolved from a primitive communist society to a slave-society era, there was a crank in the Yellow River basin