1)grooved roller,凹溝滾輪2)concave roller battery,凹形滾輪組3)lowering-in using rolling cradle,滾輪吊籃下溝4)Hoop concave spherical surface,仿形加工滾輪凹球面5)Concave wheel,凹輪6)Aomiluo gully,凹米羅溝
用法和例句
China Petroleum Pipeline Bureau undertook six bid sections,totally 1 071 km pipeline construction tasks,applying the laying method of lowering-in using rolling cradle.
