cervical air-sac

• 颈气囊

cervical air-sac的用法和样例：

例句

1. Air bags are a standard feature in most new cars.
   气囊是绝大多数新车具有的基本特点。
2. Air bags are designed to soften the impact of a car crash.
   气囊用来减轻汽车碰撞的冲击力。