flight的詞態(tài)變化

　　例句：

　　The flight will take four hours.

　　這次航行要飛4個(gè)小時(shí)。

　　The flight of birds is often beautiful.

　　鳥飛翔時(shí)總是很美。

　　We walked up a flight of stairs.

　　我們上了一段樓梯。