Back Office
Support services for a business
后勤部门（公司中不直接与外界接触的部门）
- Companies like to have their main offices in prestigious locations, but the back office can really be anywhere.
Castle in the Air
An impractical plan
空中楼阁，白日梦，想入非非的计划
- Ten years ago, people thought the waterfront park was a castle in the air, but the mayor backed it persistently, and now it’s a reality.
Darken Someone's Door (step)
Make an unwanted visit to someone's home
未经邀请或不受欢迎之下，突然造访某人的家（可用于表达“不速之客”）
- I’ve already given you too much help, and you’ve wasted it all. Don’t darken my door again.
From Pillar to Post
From one place to another, in a forced, random way
四处奔走， 到处碰壁
- My parents were always on the move and so my childhood was spent being dragged from pillar to post.
Get in on the Ground Floor
Suddenly stop making forward progress
及早入手，取得优势地位，先下手为强
- This is our chance to get in on the first floor of an industry that's going to be big.
Handwriting on the Wall
Hints of coming disaster
灾难降临的预兆，不祥之兆
- In the discontent of his subjects, the ruler saw the handwriting on the wall.
Hit the Roof (also go through the roof)
Explode in rage; become extremely angry
勃然大怒，暴跳如雷
- When I was expelled from school, my parents hit the roof.
Hit a Wall
Invest in or join something while it is still small
投资或加入一个刚创立但仍然很小的项目
To reach a point at which no more progress can be made
达到无法取得进展的程度，遇到了瓶颈
- The energy bill is expected to hit a wall in the Senate, where Republicans have enough votes to block it.
Off the Wall
Odd, strange, unexpected
不寻常的，出乎意料的
- Teenagers love his off-the-wall comedy.
