efficient的近义词/同义词有：economical, saving, thrifty, active, potent, powerful, effectual, operant, operative, productive, effective, valid, efficacious, workmanlike, capable, able, qualified, competent, technical, practical, ...

coefficient的音标：coefficient的英式发音音标为：[ˌkəʊɪ'fɪʃnt]coefficient的美式发音音标为：[ˌkoʊɪ'fɪʃnt]...

inefficiently的音标：inefficiently的英式发音音标为：[ˌɪnɪ'fɪʃntlɪ]inefficiently的美式发音音标为：[ˌɪnɪ'fɪʃntlɪ]...