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■on end 直立；連續(xù)地

The terrible sight made her hair stand on end. 那可怕的景象使她毛骨悚然。

It has been snowing for a week on end. 雪連續(xù)下了一周了。

■on file 存檔

We have all your particulars on file. 我們已把你的全部資料存檔。

The interviewer promised to keep my job application on file. 主持面試的人答應(yīng)將我的工作申請存檔。

■on fire 著火了

Wake up! The house is on fire! 快醒醒！房子著火啦！

Help! The frying’s on fire! 快來啊！平底鍋著火了！

■on foot 徒步，步行；在進行中

Shall we go by car or on foot? 我們坐車去還是走路去？

A project is on foot to build a new tunnel. 建造一條新隧道的計劃在著手進行中。

■on guard 值班，當班；警戒

The sentry is on guard. 那哨兵在擔任警戒。

Two men are on guard at the door. 兩人在門口站崗。

■on hand 在手上；在場

He always has his dictionary on hand when he studies. 他學(xué)習時總是把詞典放在手邊。

There is a teacher on hand to help during your private study periods. 自修課上有教師在場輔導(dǎo)。

■on holiday 在度假，在休假

The typist is away on holiday this week. 打字員本周休假。

They went on holiday last month. 他們上個月度假去了。

■on holidays 在節(jié)假日，在公休日

On holidays the railways put on special trains. 假日鐵路增加專列。

Travel is very heavy here on holidays. 假日這里的交通很擁擠。

【注】注意on holidays 與on holiday 在含義上的區(qū)別。

■on impulse 一時沖動，一時心血來潮

He saw them get into the car and on an impulse he followed them. 他看見他們鉆進汽車，一時沖動之下他跟了上去。

On impulse, I picked up the phone and rang my sister in Australia. 我一時心血來潮，拿起話筒就給在澳大利亞的妹妹打了個電話。

■on leave 在休假

He is coming home on leave of absence. 他將回家休假。

You cannot find John because he is on leave now. 你找不到約翰的，因為他正在休假。

■on line 在線，在網(wǎng)上；（按計劃）在運轉(zhuǎn)，在運行

You can book tickets on line. 你可以在線訂票。

If there is a power failure, the emergency generators should come on line within 15 minutes. 如果出現(xiàn)停電，應(yīng)急發(fā)電機將在15分鐘內(nèi)開始運行。

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