to think of, to ponder, to long for, to let one's thoughts wander to

💡 Nuance & Usage: Often used for thinking about distant places, people, or the past/future, sometimes with a sense of nostalgia or longing. (遠く離れた場所や人、あるいは過去や未来について、郷愁や憧れを込めて思考を巡らせる際に使われる)