一心不可二用英语

we can't do two things at the same time.

You Can't Do Both Of The Two Things At The Same Time.额……其实应该是 你不能同时去做两件事。恩……英语和汉语不太一样啦，不知道这个有没有更好的翻译……

No man can do two things at once. 一心不可二用

One cannot spin and reel at the same time这是俚语直接翻译：One can't do both things at the same time

一心不能二用One should not pursue two things at the same time.

No man can do two things at once.