耕犁
牛耕的发明,实现了从人力耕作到畜力耕作的转变。耕作工具的进步,是衡量农业生产力发展水平的标志之一。最早的耕犁是直辕犁，但由于回转不便、起土费力，唐代（618年～960年）又出现了曲辕犁，操作时犁身可以摆动，富有机动性，便于深耕，利于回旋，轻巧柔便。
Cattle farming transferred the farming ways greatly. The development of farming tools is one of the important signs to measure agriculture production levels. The most initial plough is straight shaft plough, but its shortcoming is that return is awkward and soiling is uneasy. In Tang Dynasty (618-960), curve shaft plough was invented, which can swing in operation, more flexible, suitable for complex farming, easy to return and very light.
插图
Cattle farming transferred the farming ways greatly. The development of farming tools is one of the important signs to measure agriculture production levels. The most initial plough is straight shaft plough, but its shortcoming is that return is awkward and soiling is uneasy. In Tang Dynasty (618-960), curve shaft plough was invented, which can swing in operation, more flexible, suitable for complex farming, easy to return and very light.
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来源：中国数字科技馆
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