Operation round stool 手术圆凳
rotary round stool 圆转椅
round d stool 圆凳
·2,447,543篇论文数据，部分数据来源于NoteExpress
Meanwhile, Venezuelan Edwin Valero defended his WBC lightweight title by defeating Mexican Hector Velazquez, who retired on his stool at the end of the sixth round.
BBC: Kelly Pavlik stops Miguel Espino to retain titles
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