isthmus of cingular gyrus

例句：

1. 1.The isthmus connects the two countries.
   这个海峡将两国连接起来。
2. 2.The fjord is surrounded by mountains and forests.
   这个峡湾被山脉和森林包围。
3. 3. The gulf between the two countries is widening.
   两国之间的海峡正在变宽。