A substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
元素元素，由原子组成的物质，其原子中的每一核子具有同样数量的中子、用一般的化学方法不能使之变得更为简单的物质的元素。
Cell Surface Proteases provides a comprehensive overview of these important enzymes that catalyze the hydrolysis of a protein as it degrades to a simpler substance.
当它降低到一种更简单的物质时，细胞表面蛋白酵提供一个催化蛋白质的水解作用的这些重要的酵的综述。
Chemistry Physics a substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
【物理学】元素：元素，由原子组成的物质，其原子中的每一核子具有同样数量的中子、用一般的化学方法不能使之变得更为简单的物质的元素。
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