casing chilling tub

例句：

1. 1. The casing of the computer is made of plastic.
   电脑的外壳是用塑料做的。
2. 2. The casing of the car is made of metal.
   汽车的外壳是用金属做的。
3. 3. The casing of the phone is made of glass.
   手机的外壳是用玻璃做的。