堿性基取代了的basic: Basic = Basic English. substitute: n. 1.代替者[物],代用品;候補員;后補選手;收入( ...be substituted for: 代替; 替代substituted: 取代的;代替的alkyl substituted: 烷基取代的下載手機詞典可隨時隨地查詞查翻譯