词汇	tough flow
释义	tough flow 滞流
随便看	language abrasion language acceptability language acceptance language accepter language acceptor LanguageAccess language accommodation language acquisition language-acquisition Language Acquisition and Language Disorders language acquisition and learning language acquisition device language acquisition deviceLAD language acquisition device, LAD language acquisition devise language acquisition deviselad Language acquisition environment language acquisition/learning language acquisition mechanism language acquisition model language acquisition theory language acquisition tree language acquistion process language activities Language Activity