英语翻译After taking off,we were flying low over the city and sl

英语翻译
After taking off,we were flying low over the city and slowly gaining height,when the plane suddenly turned round and flew back to the airport.
起飞之后,我们在城市上空低低地飞行,然后慢慢爬高.这时飞机突然调转头来,飞回了机场.

英语中,连词when表示"当……时候",引导的时间状语从句表示与主句动作同时或不同时,从句动词用延续或非延续性都可以.如：　　I'll telephone you when I get there tomorrow.明天我到那里的时候就给你打电话.　　但是在高一新教材Unit 15 "The necklace"中,就出现了when用作并列连词,表示"就在这时"(=and this time/just at that time)的用法.如：　　Tom was sitting near the fire when he heard a knock at the door.汤姆正坐在火炉边,这时他听到一阵敲门声.　　I was just going to speak when the doorbell rang.我正准备讲话,这时门铃响了.　　当并列连词when用于"就在这时,正在这时"的用法时,它所引导的并列句表示动作发生后,另一个并列句所表示的动作之后,一般不可以用其他词代替,常用于以下结构：　　1.was/were doing +when意思为"就在这时,正在这时".如：　　I was walking in the street when someone called me from behind.我正在街上走,就在这时有人从后面叫我.　　They were discussing the problem when the teacher came in.他们正在讨论问题,就在这时老师进来了.　　2.was/were about to do...when意思为"正要/正准备做某事,就在这时……".如：　　She was about to go out when an unexpected visitor came.她正准备出去,这时来了一位不速之客.　　We were about to set out when it began to rain.我们正要动身,就在这时开始下雨了
　　3.be+表示状态的介词短语+when意思为"正在做某事,就在这时……".如：　　They were at work in the office that　afternoon when a big fire broke out.那天下午他们正在办公室工作,就在这时一场大火发生了.　　We were on duty in the classroom when a boy rushed in.我们正在教室里值日,就在这时一名男孩冲了进来.　　Li Ping was on his way home when two boys stopped him.李平正往家走,突然两个男孩拦住了他.
　　注意：在上述三种用法的结构中,when引导的句子不能放在句首.