There was a whine of hydraulics as the undercarriage locked into position.随着液压系统嘎吱一声响，起落架进入了锁定位置。The undercarriage on light aircraft does not always retract in flight.轻型飞机飞行时起落架不一定缩回.A kind of cutter undercarriage mechan...
Umbrellas shade outdoor cafes along winding cobblestone streets.在曲折蜿蜒的鹅卵石街道的两边，一把把阳伞为露天咖啡馆遮阴挡阳。They sheltered beneath their umbrellas.他们躲到了伞下.Shall we take umbrellas with us?我们带雨伞去好 吗 ?...