Jīng / guò / cháng / qī / liàn / xí， / zhè / xiē / guī / zé / yǐ / jīng / nèi / huà / chéng / tā / de / xí / guàn。

经过长期练习，这些规则已经内化成他的习惯。

After long-term practice, these rules have become internalized as his habits.