straiten

例句：

1. 1.The river straiten the island in two.
   这条河流将岛屿分成两半。
2. 2.The road straiten as it winds through the forest.
   这条路在穿过森林时变得越来越窄。
3. 3. The bridge was straiten by construction work.
   桥梁因施工工作而变得狭窄。