n.氯四环素...

chlortetracycline的音标：chlortetracycline的英式发音音标为：[klɔ:tetrə'saɪklɪn]chlortetracycline的美式发音音标为：[ˌkloʊrə'saɪˌklin]...

Least effective were chlortetracycline, oxytetracycline, and tetracycline.效力最差的是金霉素 、 土霉素和四环素....