Chen Yaozi asked the oil seller, "Do you know archery? Isn't my archery very clever? " The old man selling oil said, "There is no other mystery, only skillful technology." Chen Yaozi said angrily, "How dare you despise my archery!" The old man said, "I know this truth from the experience of pouring oil." So I took out a gourd and put it on the ground, put a copper coin in the mouth of the gourd, and slowly poured oil into the gourd with an oil ladle. The oil was poured into the gourd through the money hole, but the money was not wet. So he said, "I have no other secrets, but I am very skilled." Chen Yaozi sent him away with a smile.
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