Birds use warm air currents to help their flight.

　　鳥利用暖氣流助飛。

　　The gang took flight when they heard the police car.

　　這伙歹徒聽見警車聲就逃走了。

　　Our flight eventually left five hours late.

　　我們的班機(jī)最終晚了五個(gè)小時(shí)起飛。

　　They announced that the flight would be delayed.

　　廣播通知，該航班將誤點(diǎn)。

　　A flight of steps led upwards to the front door.

　　一段臺(tái)階往上通向正門。