基本解释[地理] 常流河；常年河川词组短语短語perennial l stream 常劣perennial interrupted stream 常年間斷水流non -perennial stream [水利]非常流河Perennial Stream Flow 常年流量Stream perennial 長流河川perennial stream更多词组专业释义地球科學常年河常流河常劣土木建築工程常流