1)off-line cipher machine,线外式密码机2)electro-machianical ciphering machine,机电式密码机3)hand-held encryption unit,手持式密码机4)Infrared digital camera,红外线数码相机5)attached mechanical sealing,外装式机械密封6)mechanical seal with outward leakage,外流式机械密封
用法例句
An attached mechanical sealing is used during pump shut down.