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物质不能再分为更简单的物质了。 化学元素是各种材料的基础。 组成元素的原子是由带正电的质子, 中性的中子组成的原子核以及核外电子组成的 。
matter that cannot be broken down into simpler matter. chemical elements are cornerstones of materials. elements consist of atoms that consist of a nucleus of positive protons, neutral neutrons, and a shell of electrons.
Last Update: 2011-10-23
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