zero in on 瞄准;集中精力于
例句：Once you have identified suspicious traffic, you can then start to add specifications on the command line to zero in on the detail of the traffic.
Gentleman’s agreement 君子协议
例句："What we have seen over the past couple years is, you might think of it as a kind of a gentleman’s agreement not to discuss Iraq, " he said.
Walk on air 兴高采烈
例句：Some students seem to walk on air after they succeed in passing the entrance examination of college.
At an awkward age 马上成年
例句：Tom was very easy to bring up and never seemed to have an awkward age at all.
Autumn of somebody’s life 在垂暮之年
例句：It’s amazing that somebody can still contribute to society even in the autumn of his life.
Paint the lily 画蛇添足
例句：Comment upon this would be to paint the lily.
Lay at somebody’s door 归咎于某人
例句：Don’t lay the blame at my door; you spilled food on the carpet too!
Wall-to-wall 无处不在的; 似无处不在的
例句：Within minutes, the presidential salvo is wall-to-wall on the wire services and TV news. Then the Internet.
To Put on the dog 摆阔、装店面
例句：But what I like about him was that he never put on the dog to show off his money.
On the side 作为兼职
例句：He’s a teacher but he does some journalism on the side.
Get into the swing of thing 积极投入某事
例句：It took time to get into the swing of things.