at the same time
US /æt ðə seɪm taɪm/
UK /æt ðə seɪm taɪm/

1.
simultaneously; concurrently
:
•
They arrived at the same time.
•
You can't do two things at the same time.
2.
nevertheless; despite that
:
•
It's a difficult task, but at the same time, it's very rewarding.
•
He's very critical, but at the same time, he's usually right.