double tie双拉杆doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double quench hardening二重淬火double entry compressor两侧进气压气机double-discharge pump双排量泵Double-shaft banlance双轴平衡double-channel duplex双通道双工double subject identity双重主体身份double hung sash window框格吊窗double time for Sundays星期天每小时的工资是平常的两倍double variation method双变法double tube stethoscope单头双管听诊器