熟能生巧
从前，有一个年轻人，他很会射箭。有一天，他射箭，每箭都射到红心，看的人都拍手叫好。只有一个卖油的老人，什么都没说。
年轻人看见卖油的老人这个样子，心里有点儿不高兴，就问这个卖油的老人，：”你也会射箭吗？“ 卖油的老人回答：”我不会射箭， 不过，这没什么，只要熟练就可以了！“ 老人拿出一个葫芦放在地上，在葫芦口上放一个方孔的铜钱，然后把油从孔里滴下去。油滴下去了， 可是方孔上一点油都没有。卖油的老人笑着对年轻人说：”这也没什么，只是熟能生巧就是了。”
成语 Chéngyǔ，similar to English idiom, is a word group or a phrase which is established through usage and practice. Unlike English idiom, a Chéngyǔ is often made of a fixed number of Chinese characters, and most Chéngyǔ (98%) have four characters. Chéngyǔ often contain literary allusions which were derived from analogy or historical stories. The meaning of a Chéngyǔ is often much more difficult to derive from its constituents than an average English idiom. While some modern Chéngyǔ have a direct literal translation in other languages, many Chéngyǔ do not have a foreign language equivalent due to their strong historical background. One, who is able to master the use of Chéngyǔ, is considered as well-educated and receives respect.