A foreigner delivers a head of elephant,the Cao Cao is very happy,but,he want to know that the elephant has many heavy,have no the so big steelyard however.The Cao washes to thought of a way,he arrive the on the boat to the elephant" please",being the hull descend to sink,drew with part that surface mutually hand over a line in the gunwale.Then he go ashore the elephant" please" again,pack the rock toward the on the boat,pack the hull descend to sink the linear place in painting.Immediately after,called the stony weight in on the boat,rock contain many important elephants there will be many heavy.
You say,the Cao wash astute not intelligent?