toroidal shell

例句：

1. 1. The toroidal shell is aunique structure found in many planets.
   环形壳体是许多行星中发现的独特结构。
2. 2. Thetoroidal shell of the spacecraftwas designed to protect it from damage.
   太空船的环形壳体被设计来保护它免受损坏。
3. 3. The toroidal shellof the rocket is made of strongmaterials for its durability.
   火箭的环形壳体由强材料制成，以增强其耐用性。