To ponder deeply and continuously, whether walking or sitting; to be constantly preoccupied with a thought or to reminisce.
他对待工作总是非常认真，无论走到哪里，都在行思坐筹，力求每一个细节都做到最好。
He always takes his work very seriously, constantly pondering and planning, striving for perfection in every detail, no matter where he is.
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