For 3,000 years, people have been cut or given leeches to let out the blood because they thought that would make people better.
三千年来，人们划破皮肤放血或使用水蛭吸血，因为他们认为放血可以改善人们的身体。
For 3,000 years, people have been cut or given leeches to let out the blood because they thought that would make people better.
三千年来，人们划破皮肤放血或使用水蛭吸血，因为他们认为放血可以改善人们的身体。
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