very different kettle of fish

• 截然不同的人

very different kettle of fish的用法和样例：

例句

1. Different people can draw completely different conclusions.
   不同的人会得出截然不同的结论。
2. To people who are familiar only with the common European languages the Chinese language is strikingly different.
   对于那些只熟悉普通欧洲语言的人来说，汉语是一种截然不同的语言。