This was very big in an ad campaign at least last year, I'm not sure if it still is, with the little butterfly.

它的广告宣传做得很大，至少在去年是这样的，我不确定它现在还是不是，它这里有一个小蝴蝶。

麻省理工公开课 - 化学原理课程节选

Here's one more example, last but not least.

下面是最后一个例子，也很重要。

I was 课堂 - SpeakingMax英语口语达人