prolongation

n.延长；延长部分

There was an indefinite prolongation of the peace talks. 和谈被不确定的延长了。

But the shelf is also a geographical term, used to describe the physical prolongation of land below the sea. 但是，大陆架同时又是一个地理词汇，用来描述海下包括延伸到200海里之外的地理面积。