The cat was now within striking distance of the duck.

　　此時(shí)，貓就在可攻擊鴨子的距離內。

　　Ducks were swimming around on the river.

　　鴨子在河面上游來(lái)游去。

　　We ducked down behind the wall so they wouldn't see us.

　　我們弓身躲在墻后不讓他們看見(jiàn)。

　　She ducked her head and got into the car.

　　她低著(zhù)頭進(jìn)了汽車(chē)。

　　He ducked the first few blows then started to fight back.

　　他躲開(kāi)最先幾拳后便開(kāi)始反擊。