因为potato是以o结尾的词。在英语当中以o结尾的词变复数加es。potatoes的意思是马铃薯，土豆，洋芋。potatoes的例句：The potatoes cropped well this year（今年马铃薯丰收）。

potatoes的例句：The delivery of potatoes was several kilos light（送货送来的土豆少了好几公斤）；The potatoes were sold loose, not in bags（土豆是散装而不是袋装出售）。