1. The river broadens at its mouth. 
   河囗处河面变宽。
2. This river divides at its mouth. 
   这条河在河口处分岔。
3. The river fans out near the river mouth. 
   那条河在近河囗处展开成扇状。
4. They were fishing the mouth of the river. 
   他们在河口钓鱼。
5. A divergent section of a river, especially near the mouth. 
   河流分支河流的分岔部分，特别是近河口地区

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• 1. 河口
  river maintenance 河川维护...river mouth 河口...river system 河系
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