短语词组短语snapback primer 弹回探针snapback detail 急速返回reverse snapback 反向转折double snapback 双倒扑snapback dna 快速复性DNAsnapback fibre 弹性纤维snapback method [管理]急速反回法snapback characters 回扫特性snapback region 入骤回崩溃区 返回 snapback