marginal ridge

例句：

1. 1. The mountain's marginal ridge is visible fromthe top of the peak.
   这座山的边际脊从山顶可见。
2. 2. The riverflows through a narrowmargin between two mountains.
   这条河在两座山之间流过，非常狭窄。
3. 3. The scientist observed the marginal ridges on the surface of the ocean.
   这位科学家观察了海洋表面的边缘脊。