牙口yá·kou 1.指牲口的年龄(根据牲口的牙齿多少可以判定牲口的年龄){age of a draught animal as shown by the number of its teeth}: 这头牛～不老。{Judging from its teeth this ox is not old at all.} 2.(～ㄦ{yá·kour})指老年人牙齿的咀嚼能力{chewing ability of an old person's teeth}: 您老人家的～还好吧?{I suppose your teeth are still in a good condition, aren't they?}