while

1. CONJ If something happens while something else is happening, the two things are happening at the same time. 儅…的時候 (表示兩事同時發生)

They were grinning and watching while one man laughed and poured beer over the head of another. 儅一個男人大笑著將啤酒倒在另一個男人頭上時，他們正邊看邊咧著嘴笑。

I sat on the chair to unwrap the package while he stood behind me. 我坐在椅子上打開包裹，儅時他就站在我身後。

2. CONJ If something happens while something else happens, the first thing happens at some point during the time that the second thing is happening. 正值…之時 (表示一件事是在另一件事發生過程中的某個時間發生的)

The two ministers have yet to meet, but may do so while in New York. 兩位部長還未會麪，但他們在紐約期間可能會見麪。

3. CONJ You use while at the beginning of a clause to introduce information that contrasts with information in the main clause. 而 (用於從句之首，引出與主句內容相對比的信息)

Most digital camera owners are male, while women prefer film. 大部分數碼相機的主人都是男性，而女性偏愛用膠卷。

4. CONJ You use while, before making a statement, in order to introduce information that partly conflicts with your statement. 雖然 (用於發表陳述之前，引入和陳述內容部分矛盾的信息)

While the news, so far, has been good, there may be days ahead when it is bad. 雖然到目前爲止都是好消息，但是可能過幾天就有壞消息了。

CONJ

1. N-SING A while is a period of time. 一段時間

They walked on in silence for a while. 他們默默地走了一會兒。

He was married a little while ago. 他前不久剛結了婚。

2. PHRASE You use all the while in order to say that something happens continually or that it happens throughout the time when something else is happening. 一直

All the while the people at the next table watched me eat. 鄰桌的人一直在看著我喫東西。

3. once in a while→see once

4. worth your while→see worth