1. The exoskeleton of a crab is hard and protective.
螃蟹的外骨骼又硬又保护性。

2. Insects have exoskeletons that provide support and protection.
昆虫有外骨骼，为其提供支撑和保护。

3. The exoskeleton of a lobster is made of chitin.
龙虾的外骨骼由几丁质构成。

4. Some animals, like turtles, have both an exoskeleton and an endoskeleton.
有些动物，如乌龟，既有外骨骼又有内骨骼。

5. Scientists are studying how to create artificial exoskeletons to assist people with mobility issues.
科学家正在研究如何制造人造外骨骼，以帮助行动不便的人。

6. The exoskeleton of a beetle is lightweight but strong.
甲虫的外骨骼轻巧但坚固。