雅思词组1:at all times 总是，始终，随时
Locking doors at all times...men didn't think it was quite as important as women,but both gave it a high safety rating.
近义词组：all the time
雅思词组2:at any time 在任何时候
You're supposed to ask for a home visit before 10:30 in the morning, but obviously, if it's an emergency, you can phone at any time, night or day.
近义词组：at all hours
雅思词组3:at least 至少
At least, we've done the oral presentation-I thought that was good, the way I got my feedback really quickly.
She may receive little education, but at least she is reliable.
The interesting side of sports physiology, at least in my view, is the side that looks at the micro level, looking at cellular change. The researchers are doing cellular research, looking at changes in body cells when the body is under stress.
近义词组：no less than
雅思词组4:at one's service 愿为某人服务
I'm glad to be at your service, Sir.
雅思词组5:at risk 在危险中
We know from modern farming that if the Ievel of breeding stock falls below about three hundred females, the future of the species locally is at risk.
近义词组：at stake, in danger
雅思词组6:at some stage 在某些时候;在某阶段
I want to ask where the staff room is in case I need to find a teacher at some stage
雅思词组7:at the end of 在…的尽头;…结束之时
You've chosen to visit the rainforest in March, which is just at the end of the wet season, so you'll soon notice how well the waterfalls are running and also how damp the ground is.
You will notice at the end of each corridor that there is another door but these are fire doors and are kept locked from the outside.
雅思词组8:at the expense of 以…为代价
The rapid urbanisation in this country is occurring at the expense of both rural lifestyles and precious cultural heritage.
近义词组：at the cost of
雅思词组9:at the moment 当下，目前
At the moment, your task is to get over the difficulties and start afresh again.
雅思词组10:at the outset 开端，开始
Your tutors will tell you at the outset how to set out the chapters they require but you will need to ask them how they would like you to organise the bibliography because it varies depending on your subject area.
近义词组：at the beginning