carapace valve

例句：

1. 1. The carapace is made of a hard material that protects the internal parts.
   外壳由一种硬质材料制成，保护内部部件。
2. 2. The scientist carefully removed the carapace to examine the inner workings.
   科学家小心翼翼地移除了外壳，以检查内部结构。
3. 3. The carapace is essential for the survival of the organism as it provides protection from predators.
   外壳对于该生物的生存至关重要，因为它提供了对捕食者的防护。