idea：n.想法；构思；主意；印象；概念；意见；看法；信念；
复数： ideas
例：
Many people do not like the idea of experiments on animals.
许多人不赞成在动物身上做试验。
He has no idea how to run a business.
他丝毫不懂企业管理。
I don't think much of her idea.
我认为她的主意不怎么样。
This idea isn't new.
这主意不新鲜。
Have you any idea of its value?
你知道它的价值吗？
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