所谓单关，一般指对应于原有处在三、四线上的子向中腹或边部垂直地有间隔（隔一为单关，隔二为大关或二间关）跳出或跳下。在这种情况下，现今“关”已有被用“跳”取代的趋势。因“跳”较通俗，“关”显文气。
单关节炎 monarthritis
单关节 [解剖] simple joint ; [解剖] articulatio simplex ; Articulus simpelx ; simple articulation
报关单 [贸易] customs declaration ; declaration form ; customs formalities ; [贸易] bill of entry
报关单号 serial number of customs declaration ; Declaration number
进口货物报关单 Import Declaration Form ; goods declaration for implortation ; ENTRYDECLARATION ; Import declaration
出口报关单 The export declaration form ; declaration for exportation ; Entry Outwards ; Export Declaration
单关节的 monoarticular
铰链工单关闭差异 Hinged work order close difference ; Differences between single-closure hinged workers
简单关系 Simple Relationship
菜单关机 win
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