1. Once he learned that his girlfriend likes stamps, he is collecting stamps for her like crazy.2. He risked his life to save a stranger.
 do something like crazy work as hard as one can; work one's butt off give it all go out of one's way, try very hard to do something, go to great lengths to do something, spend the entire day doing something, etc. risk one's life to do something最普遍. Risk one's life 指拼了某人的命去做某事情, 通常指救人
1. 當他知道女友喜愛郵票後就拼命為她收集郵票.2. 他拼命救了一個陌生人.