1. Passengers were asked to deplane after the flight was delayed for several hours.
飞机延误了几个小时后，乘客被要求下机。

2. Please remain seated until the captain announces that it is safe to deplane.
请保持坐着，直到机长宣布安全下机。

3. The flight attendants helped the elderly passengers deplane first.
飞机乘务员帮助老年乘客先下机。