与水平安定面相连的是两个称为 “ 升降舵 ” 的可动操纵面.Attached to the stabilizers are two movable surface called " elevator ".俯仰力矩的变化由升降舵的偏转来提供.A variable pitching moment is provided by moving the elevator.飞机的升降舵可以使它升降自如.The elevator of an airc...
The director will be presented with a memento for his long years of service.主管因为公司效力多年将获赠予纪念品。They gave him a watch as a memento of his time with the company.他们送了他一块手表作为为公司服务的纪念。My friend gave me his picture as a memento...