活化 huóhuà activation Definitions Defs Origin Strokes Stroke Words Sentences Sents 活化石 huóhuàshí living fossil 活化分析 huóhuàfēnxī activation analysis 生物活化性 shēngwùhuóhuàxìng bioactivity 表面活化剂 biǎomiànhuóhuàjì surfactant