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....
Shirley's brother is now a consultant heart surgeon in Sweden.雪利的兄弟现在在瑞典做心脏外科高级顾问医师。Only your family doctor can refer you to a surgeon.只有你的家庭医生才能把你介绍给外科医生。He knew that under the surgeon's knife he would surely ...