metal envelope

• 金属壳

metal envelope的用法和样例：

例句

1. The metal casing and frame of the compressor must be properly earthed.
   必须将压缩机的金属壳体和框架正确地接地。
2. A rack-and-pinion gear set is enclosed in a metal tube, with each end of the rack protruding from the tube.
   整个齿轮齿条式转向器装载金属壳内，其齿条从转向器伸出来与转向摇臂连接。