那是另一回事。

That is quite another matter.

That's another matter.

Source: Tatoeba

Sentence Composition

=1 那是 nàshi
  1. (coll.) of course
  2. naturally
  3. indeed
=1 那是 nàshì
  1. (colloquial) of course
  2. of course
2 另一 lìngyī
  1. another
  2. the other
3 回事 huíshì (old) to report to one's master