Guan Yu is a historical figure in the romance of the Three Kingdoms. He is brave and resourceful. Once, when Guan Yu led his troops to attack Cao Bing, he was shot by the enemy's poisonous arrow in his right arm. After that, although he recovered, his bones still ache every rainy day. The doctor said that the arrow is poisonous and the poison has entered the bones. He should cut his arm and scrape the poison off the bones before the disease can be completely removed.<br>
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