potatoes可数吗

　　She put some potatoes on to boil.

　　她煮了些土豆。

　　The potatoes are planted by machine.

　　这些土豆是用机器种植的。

　　Layer the potatoes and onions in a dish.

　　把土豆和洋葱分层放在盘子里。

　　They got through a sack of potatoes.

　　他们把一麻袋土豆吃完了。

　　I'll dig some potatoes for lunch.

　　我要挖点土豆作午餐。