郵遞人員聽見了小鴨子的叫聲，并被允許打開箱子喂這些幼雛食物和水。

　　Postal workers heard the ducklings and got permission to open the box to get the babies some food and water.

　　每只鴨子叫一次或者多次，叫聲此起彼伏。

　　Each duck makes the sound one or more times, one after another.

　　如果一個(gè)動(dòng)物很像鴨子，叫聲和鴨子一樣，走路也像鴨子，同時(shí)有足夠的證據(jù)顯示它就是鴨子，那我們就叫它鴨子。

　　If something looks like a duck, sounds like a duck, walks like a duck and there is enough evidence to prove it's a duck, then that's what we'll call it.