《管子·形势解》
他操弓时，审明其高下，掌握必能射中目标的规律，故能百发百中。
其操弓也，审其高下，有必中之道，故能多发而多中。
When he drew his bow, he carefully assessed the height and distance of the target and mastered the laws of archery so that he could hit the target every time.