活性氧类 huóxìngyǎnglèi reactive oxygen species Origin Definitions Defs Strokes Stroke Words Sentences Sents 活性 huóxìng activity the ability of a substance to cause a chemical reaction or physical change; chemical activity氧 yǎng noun oxygen oxygen; a colorless, odorless gas necessary for life and combustion类 類 lèi noun category kind; type; class; category; group