反牵引（reverse drag，turnover）是指在平缓地层的铲形正断层上盘反牵引构造沿断面作旋转式下滑时，上盘岩层因受重力作用在断层两盘间出现的空隙部位下陷所形成的向上凸出的背形弯曲。
n. turnover
misc. reverse drag
断层附近的反牵引现象是正确判断断层性质、准确寻找断失盘煤层的一项非常重要的干扰因素。
The phenomena of reverse folds nearby fault is a very important interfection factor by which to Judge faulted character and search for lost ledge coal bed.
目的评价前方牵引器联合快速扩弓矫治恒牙早期骨性前牙反牙合的有效性。
Objective To evaluate the maxillary protraction appliance permanent teeth combined rapid expansion of early bone anterior crossbite effectiveness.
前方牵引器；快速扩弓；骨性前方反牙合。
Front tractor; Rapid expansion bow; The front teeth osteoarthritis.
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