1)grooved roller,凹沟滚轮2)concave roller battery,凹形滚轮组3)lowering-in using rolling cradle,滚轮吊篮下沟4)Hoop concave spherical surface,仿形加工滚轮凹球面5)Concave wheel,凹轮6)Aomiluo gully,凹米罗沟
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.