百步穿杨（百步穿楊）　

◎ 百步穿杨 bǎibù-chuānyáng

[shoot an arrow through a willow leaf a hundred pass away,shoot with great precision] 春秋时代,楚国的养由基善射,能百步内射中柳叶。比喻善射者

奖射者曰有百步穿杨之巧,史,楚有 养由基善射,去柳叶百步而穿之,百发百中。——《书言故事·射艺类》