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1·Unemployment peaked at 17%.

失业率达到17%的最高点。《牛津词典》

2·They returned at twilight.

他们在黄昏时返回。《柯林斯英汉双解大词典》

3·She's still at varsity.

她还在上大学。《牛津词典》

4·She excels at sports.

她在体育运动方面很优秀。《柯林斯英汉双解大词典》

5·We changed at Crewe.

我们在克鲁换的车。《牛津词典》

6·I'm at home tonight.

我今晚在家。《柯林斯英汉双解大词典》

7·I reside at the mission at St. Michael's.

我住在圣迈克尔教堂的布道所。《柯林斯英汉双解大词典》

8·Help was at hand.

援助近在咫尺。《牛津词典》

9·We woke at dawn.

我们在黎明醒来。《牛津词典》

10·I always feel at home at Ye Olde Starre Inn.

在昨日星辰客栈，我总是觉得非常舒适安逸。《柯林斯英汉双解大词典》

在

1·The place is packed at lunchtime.

这个地方在午餐时间非常拥挤。《柯林斯英汉双解大词典》

2·The troops landed at dawn.

部队已在黎明登陆。《牛津词典》

3·I met her at the hospital.

我在医院遇见了她。《牛津词典》

4·He was fogbound at JFK airport.

他因浓雾而被困在肯尼迪机场。《柯林斯英汉双解大词典》

5·Let's have the party at my house.

我们在我家里聚会吧。《牛津词典》

于

1·The couple met at a party.

这对夫妇相识于一个派对。《柯林斯英汉双解大词典》

2·The line cuts the circle at two points.

那条线与圆相交于两点。《牛津词典》

3·My brother studied at the Royal College of Art.

我哥哥曾就学于皇家美术学院。《牛津词典》

4·Work on the office building will be complete at the end of the year.

办公大楼工程将于年底竣工。《牛津词典》

5·The program guidelines and other related information are available at the website.

项目指南及其他相关资料记载于该网站中。

以

1·They set off at a steady pace.

他们以不紧不慢的速度出发了。《牛津词典》

2·Cars passed at irregular intervals.

汽车以不规律的时间间隔驶过。《柯林斯英汉双解大词典》

3·Many items are at half price.

许多商品都以半价出售。《牛津词典》

4·He was driving at 70 mph.

他以每小时70英里的速度驾车行驶。《牛津词典》

5·We drove along at a terrific speed.

我们以极快的速度驱车行驶。《牛津词典》

(1)AT all（否定句）根本；究竟

(1)be in AT在场，参与

(1)AT it again[口语]争吵；重复负面消极的行为(此语亦可含有与性行为有关的意思)