1. ahead，作副词，意为“向前面，在前面” I'll run ahead and warn them.我要跑在前头，警告他们。The road ahead was blocked.前面的路被封了。2. aim，作名词或动词，意为“目的，目标，力求达到，旨在”等 She went to London with the aim of finding a job.她去伦敦是为了找工作。We aim to be there around six.我们力争六点钟左右到那里。3. airport，作名词，意为“机场，航空站” Many local people object to the building of the new airport.许多当地的居民反对兴建新机场。A bus transported us from the airport to the hotel.一辆公共汽车把我们从机场送到旅馆。4. alarm，作名词或动词，意为“警报，警报器，使惊恐”等 I jumped out of bed as soon as the alarm clock went off.闹钟一响我就从床上跳了起来。We could not see what had alarmed him.我们搞不明白是什么使他忧虑不安。5. alarming，作形容词，意为“使人惊恐的，令人惊慌的”等 The rainforests are disappearing at an alarming rate.雨林正以惊人的速度消失。There is an alarming increase in crime these years.这些年犯罪率惊人地上升。
