stool的复数形式为：stools...

O'Brien sat on a bar stool and leaned his elbows on the counter.奥布赖恩坐在一张吧凳上，胳膊肘靠在吧台上。A 33 - year - old woman was admitted due to hematemesis and passage of tarry stool.一位三十三 岁 女性因为吐血及黑便而住院,病患曾因腹部穿刺伤在他院接受剖腹探查术.A youn...