cone delta

例句：

1. 1.The cone-shaped delta is a natural wonder in the river's mouth.
   锥形三角洲是河流入口处的一个自然奇观。
2. 2. The cone-shaped delta is formed by the slow flow of water over time.
   锥形三角洲是由水流缓慢形成的时间积累而成的。
3. 3. The cone-shaped delta is often used as a landmark for navigation.
   锥形三角洲常被用作导航的地标。