danshui shell carving picture

例句：

1. 1.The crab has a hard shell to protect itself from predators.
   螃蟹有硬壳来保护自己免受捕食者的伤害。
2. 2.The ship's hull is made of steel and has a protective shell.
   这艘船的船体是用钢铁制成的，并有保护层。
3. 3. The turtle has a hard shell that can protect it from predators.
   乌龟有一层坚硬的壳，可以保护它免受捕食者的伤害。