subshell closure

例句：

1. 1. The subshellof the ship is designed to protect passengersfrom the elements.
   船的子壳设计用来保护乘客免受恶劣天气的影响。
2. 2. The shellclosure mechanism ensures that the food remains freshand intact during storage.
   壳闭合机制确保食物在储存期间保持新鲜和完整。
3. 3. Thesubshell of the car provides additional protectionfor the engine compartment.
   汽车的子壳为发动机舱提供了额外的保护。