Here's an ego crusher for mice. Even a drop of oil can navigate a complex maze. If you don't believe us, check out the video.

对于老鼠来说这个迷宫就是自尊粉碎机。但是一滴油却能破解这个复杂迷宫。不信，看看视频吧。

youdao

You know, car purchases are a complex gumbo of emotion and economics and ego and sex and all the rest, and it's just a question of, you know, how many parts of those various elements do you put into your decision-making hat to come up with the answer?

NPR: Do Hybrid Cars Save Money?