中英释义：
重点词汇
-
流域
drainage basin; river basin; watershed; valley; basin; drainage area; reaches
-
分界线
dividing line; divide; division; boundary; line of demarcation; demarcation
流域
drainage basin; river basin; watershed; valley; basin; drainage area; reaches
分界线
dividing line; divide; division; boundary; line of demarcation; demarcation