Question

من میگم نره تو میگی بدوش چی میشه؟

Answer 1

You can't milk a bull

You can pull and pull, but you can't milk a bull

Comments

دقیقا معناش همینه

---

This is originally a quote by Strauss (1994) and serves the purpose well:

http://quotes.yourdictionary.com/bull

https://en.wikiquote.org/wiki/English_proverbs

Answer 2

Also:

I can't milk a duck.

http://en.termwiki.cn/EN/milk_a_duck