Planes are crowded, airlines overbook, and departures are almost never on time.飞机上很拥挤，航班也超员预订，而且起飞几乎从来没有准时过。Overcrowding in secondary schools is pretty severe.中学里超员情况十分严重。The flight was overbooked, and I got bumped off.航班预订超员，我被强行挤掉了。Sorry, the plane is overbooked.对不起，飞机已超员预订了。