音标发音英式音标 [baɪˌɒt.ɪk ˈɪn.deks]美式音标 [baɪˌɑː.t̬ɪk ˈɪn.deks]英式发音 美式发音 基本解释生物指数。同根派生 英英字典剑桥英英字典 a way of measuring the pollution (= dirty substances) in water, e.g. a river, by counting the organisms in it