Look at the point
重点───a key;看───see
Housing is a key driver of the economy.───住房是拉动经济的主要因素。
Cost was a key element in our decision.───价钱是我们决策时考虑的主要因素。
He was a key figure in the campaign.───他是这场运动的关键人物。
At this point a key computer system had switched to alternative power and controls needed to keep the plane stable had been damaged.───正是在这个关键点，（飞行）计算机系统被转到备用电源和努力去保持受损飞机的平稳。
The reception give him a key to the front door or to the main door of the hotel.───前台给了他一把打开饭店前门即饭店正门的钥匙。
Thus, Derby can be a key part of any kind of "offline" strategy, making data available even when the server is not.───因而，Derby可以成为任何“脱机”策略的关键部分，从而在服务器不可用时访问数据。
Cost was a key element in our decision.
I'd like a key to room 809, please.
I heard someone turn a key in the lock.
A key word index is an enlargement to the book.
I'll give you a key then you're free to come and go as you please.