双档

埃迪：嘿，迈克兄长，你和你爸，我和我爸，来次双档怎么样？

Eddie : Hey , Mike . Listen , maybe you and your Dad could double with me and my Dad some night .

前路减压植骨双凤尾档板固定术治疗胸腰椎骨折伴不完全性截瘫

Anterior decompression bone grafting and double phoenix tail plate fixation in the treatment

通常连续变焦系统的结构很复杂，在一些特殊应用下，常使用结构简单的双视场两档变焦系统。

Usually , the structure of continuous zoom system is very complex . In some special applications , the simple structure often used as field correspondent for the Dual-FOV zoom system instead of continuous zoom system .

全液压、双驱动、双振幅、两档无极变速。双钢轮压路机行走液压系统仿真分析

Hydrostatic transmission , double drive , two amplitudes , two gears and infinitely variable speed . Simulation analysis of travel hydraulic system on tandem roller