1. The gap between the rich and poor regions widened.
   富饶和贫困地区之间的差距扩大了。
2. We shall have to widen out the river bed to avoid flooding.
   我们将加宽河床以防洪水。
3. The city is widening this street.
   该城正在拓宽这条街。
4. The gap between the haves and the have-nots is widening.
   贫富之间的差距在扩大
5. The river widens as it flows.
   河道渐变宽。

　3个名词解释