یهویی کمرم گرفت

Question

داشتم بار خالی می کردم که یهویی کمرم گرفت

Answer 1

I was unloading loads when suddenly I pulled/strained a muscle in (my) back.

Comments

Hi, and +1 for you.

what do you think of "and" instead of "when"?

also, wouldn't be better if starting with "while"?