很多年前,我们的祖先学会了使用工具,学会了打猎、收集果实,学会了穿衣服,吃烤熟的食物。再后来,发明了各种各样的农具,开始种植农作物,人类的食物更加丰富起来了。那时还没有金属,农具都是用石头、动物骨头、贝壳等制作的。商周时期,青铜器出现了,于是出 Many years ago, our ancestors learned to use tools, learned to hunt, collect fruits, learned to dress and eat cooked food. Later, various kinds of agricultural implements were invented and crops were started to be cultivated. Human food was enriched. At that time, there was no metal, and tools were made of stone, animal bones, shells and the like. Shang and Zhou Dynasties, bronze appeared, so out