如果你的论题是关于水果的，那么将苹果和橘子混合是好的；但是如果你的论题是关于维生素C的，那就是不好的，因为苹果和橘子相对于维生素C是不同的关系。

It is fine to mix apples and oranges, if your question is about fruit, but not if your question is about vitamin C and you know that apples and oranges are different with respect to vitamin C.

youdao