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Many years ago it was taught that plants and animals were composed of different materials: plants, of a chemical substance of three elements,- carbon, hydrogen, and oxygen; animals of one of four elements, nitrogen being added to the other three.
许多年前，人们就知道植物和动物是由不同的物质组成的:植物是由三种元素组成的化学物质——碳、氢和氧;四种元素之一的动物，氮被添加到其他三种元素中。
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16 种意境 · 9:16 竖屏 · 1440 × 2560 高清图片