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....
When the images line up exactly, the projectors should be fixed in place.图像完全对齐时，投影仪的位置就应该固定下来。Energy projectors fired and peeled off the ships'armor in a flash.能量投射器开火然后在一阵闪光后剥离了飞船的装甲.All classrooms equipped with c...