1. 仔细考虑;深入考虑
If you are cogitating, you are thinking deeply about something.

1. use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

e.g. I've been thinking all day and getting nowhere

Synonym: thinkcerebrate

2. consider carefully and deeply
reflect upon
turn over in one's mind