difficult to expectorate是什么意思，difficult to expectorate的翻译，difficult to expectorate音标、读音、用法和例句

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difficult to expectorate是什么意思，difficult to expectorate的翻译，difficult to expectorate音标、读音、用法和例句_伍贰汉英词典

difficult to expectorate

基本解释

专业释义

医药科学