torulus

例句：

1. 1. The tortoise has a long neck and can spin its shell to protect itself from predators.
   乌龟有长脖子，可以转动壳来保护自己免受捕食者的伤害。
2. 2. The tortoise's shell is made of calcium carbonate and is used as a protective layer against predators.
   乌龟的壳由碳酸钙制成，用作抵御捕食者的防护层。
3. 3. The tortoise spins its shell by using the energy from its movements.
   乌龟通过利用其运动的能量来转动它的壳。