As for me ,i think it can be translated into "过度思考某事” .For example: "“I don't like to dwell on something I cannot change,” Baldwin said.”
And besides it can be translated into “沉溺于做某事,纠结于做某事”. For example:
"Resilience is the ability not to see failure as something to dwell on but as an opportunity to move forward, accepting that failure is a part of life. "
''I think if you do something and it turns out pretty good, then you should go do something else wonderful, not dwell on it for too long."