1、above all/after all/at all/in all/all but
①above all 首先，特别是，最重要的是
Children need many things ,but above all they need love.
②after all 到底，毕竟
The day turned out fine after all.
③at all (用来加强语气)与not连用，表示“一点也不，完全不”。
He wasn’t at all tired.
Do you feel ill at all(真的，确实)？
④ in all 总共
There were twenty in all at the party.
⑤ all but 几乎，差点没（=almost,nearly）
We have all but finished the work.
2、accident/event/ incident
event一般指重大事件。
The broadcaster is broadcasting the news on current events.广播员正在播报时事新闻。
accident多指意外或偶然发生的事故，特别是不幸的、有损害性的事故。
He was badly injured in the traffic accident.在那起交通事故中，他严重受伤。
incident相对于accident来说，显得不很重要，指“小事件”，它还可以用来表示“事变”，如叛乱、爆炸等。如：
There was an incident on the bus: a man fought with the conductor.那辆公共汽车上发生了一件事，有个人和售票员打了起来。
Have you heard of Xi’an Incident?你听说过“西安事变”吗？
3、admit vt.
①接纳，许可……进入（allow sb./sth.to enter）
He was admitted to the school this year.Only two hundred boys and girls are admitted to our school every year.
②承认，后可接名词，doing、从句或复合结构。
I admit my fault. She admitted having read the letter. He admitted that his comprehension was weak.
You must admit the task to be difficult.
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