化学改变，生成新物质的变化，又称化学反应，即：分子分成原子,离子，原子、离子重新排列组合构成新物质的过程。没有生成新物质的变化,叫做物理变化,两者要区别开。
化学改变
双语例句原声例句
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而红细胞异常往往是胞膜上发生某些化学改变或其变形的物理性能降低。
And red blood cell often is afterbirth unusually certain chemistry happens to change on film or function of its metabolic physics is reduced.
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研究者寻找并发现了靠近肿瘤组织的健康组织中有“DNA甲基化”这种化学改变。
Researchers looked for - and found - a chemical change called DNA methylation in healthy tissue adjacent to breast tumors.
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在未来不需要脂肪也能维持的必要生物化学改变产生前，添加的身体脂肪可允许形体维系更高的振动。
The additional body fat allows form to hold a higher vibration prior to the alterations in the biochemistry necessary to sustain such a vibration without the fat.
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If you were to make that change you would find that the molecule now has completely different biological and chemical properties.
如果要做出这样的变化,你会发现,分子的生物形状,和化学性质完全改变了。
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This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.
这表示你可以改变中子数,而不会改变它的化学特性，因为化学特性是由质子决定的。
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That can happen but that's abnormal, but changes in maybe the chemistry of the backbone that holds the nucleotides together.
这可能发生的,但属于非正常的变化,而是改变诸如维持核苷酸序列的,主链的化学结构
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