anchor stone

例句：

1. 1. The ship's anchor stone is securely fastened to the seabed.
   船的锚石牢固地固定在海底。
2. 2.The ancient city was built on a rocky outcropping, providing a natural anchor stone for its defenses.
   这个古老的城市建在一个岩石突出的地方，为它的防御提供了天然的锚石。
3. 3. The boat's anchor stone has been damaged by the strong current.
   这艘船的锚石因强流而受损。