the big cheese是一种比喻，指一个组织机构中的最有权势的人，也就是我们常说的大老板。
- The big cheese is coming to visit our office today - she's the owner of the whole company!
- I don't want to work as a secretary all my life. One day, I'm going to be the big cheese!
值得注意的是，如果形容两个人截然不同就可以说他们俩就像chalk and cheese，说明两个人一点都不一样。
- Sarah and Alice are identical twins, but they are like chalk and cheese. Sarah is very shy and quiet and Alice is very loud and outgoing.