Definition
to contemplate something thoroughly over a prolonged period of time
深入思考；仔细考虑
She needs to mull over the proposal before making any decisions.
她需要仔细考虑这个提案，然后再做决定。
After mulling it over for a few days, he finally decided to accept the job offer.
在仔细考虑了几天后，他最终决定接受这份工作邀约。
They took months to mull over the various possibilities of the plan.
他们花了几个月的时间来仔细考虑这个计划的各种可能性。