idea意思是主意；想法；概念；构思。
例句：
1、It seemed like a good idea at the time.
当时这主意好像不错。
2、It would be a good idea to call before we leave.
我们出发之前打个电话是个好主意。
3、The government is long on ideas but short on performance.
这个政府想法很多但执行的却太少。
4、I'd like to take this idea a step further.
我想把这一思想深化一步。
5、I had some idea of what the job would be like.
我对于这份工作有了一些了解。