He was about to shut the door when an idea came to him.

他正准备关门时，突然想起了一个主意。

《柯林斯英汉双解大词典》

I have an idea. How about music?

我有个主意。音乐怎么样？

youdao

Shh! I'm getting an idea.

嘘！我有了个主意。

youdao

But some historians suggest that the inclusion of opponents may not have been as smart an idea as Lincoln had hoped.

VOA: special.2009.02.09

Yeats sees the Second Coming as an image, as a myth, an idea, a metaphor, a certain stylistic arrangement of experience.

叶芝把第二次降临看成一个意向，一个神话，一个意识，一个比喻，一种诗意的安排和感受。

耶鲁公开课 - 现代诗歌课程节选

But something that tugs at an idea or a feeling that you really can't define or name, that is timeless.

但那些激发你某种莫名的想法或感觉的东西，却是永恒的。

关于现代美术 - SpeakingMax英语口语达人

Actually got an idea that, hey let's cooperate and try to get this thing right.

NPR: New Orleans Family Heads North

Ingestible sensor chips are an idea a little easier for most people to swallow.

FORBES: Ingestible, Implantable, or Intimate contact; How Will You Take Your Micro-scale Body Sensors

Because this is an idea, that four or five years ago, Republicans were touting.

FORBES: Gruber: Romney Is "Lying"; Romneycare and Obamacare Are "The Same F***ing Bill"