奇怪（或奇特）的想法strange idea

• 长城产生的历史必然性和普遍性，绝非是某个历史人物忽发奇想而生造出来的。

  The history created by the Great Wall of China is inevitable and universal; it was by no means the result of a strange idea that suddenly came to a certain figure in history.

• 他突发奇想用葫芦装酒。

  He suddenly had a strange idea to use a gourd to hold wine.