He is course tutor in archaeology at the University of Southampton.他是南安普敦大学考古学课程导师。He was my personal tutor at university.他是我大学时的个人指导教师。They engaged a resident tutor.他们聘用了一名住家的家庭教师....
轻型飞机飞行时起落架不一定缩回.The undercarriage on light aircraft does not always retract in flight.男孩看见那条蛇吓得猛地缩回.The boy started back in fear when he saw the snake.但是现在要缩回来当然为时已晚.But it was too late then, of course, to back out....