adj.级别/地位高的,资深的;(比赛)成人的,高水平的;
n.较年长的人;上司;资深运动员;高年级/毕业班学生;
例句:
He is three years senior to me.
他比我大3岁.
They are senior students.
他们是高年级学生.
She is a senior patient.
她是一位高龄患者.