短語詞組短語chemical constituents constituent 化學(xué)成分chemical trace constituent 化學(xué)痕量成分precipitation chemical constituent 降水化學(xué)組成chemical constituent analysis 成分分析characteristic chemical constituent 特征性化學(xué)成分analysis of chemical constituent 化學(xué)成分分析Newly added chemical constituent 新增成分chemical constituent change 化學(xué)成分的變化main chemical constituent 主要化學(xué)組分 返回 chemical constituent