《魏书·列传·卷二十九》
倘若胡人有非分之意，也要等到秋冬之际，因气候有利才敢行动。
脱有非意，要待秋冬，因云而动。
In case of any thoughts of disloyalty in Hu people, they will wait until autumn and winter when the climate is favourable before they dare to make any moves.