果醬是不是可數(shù)名詞

　　Heat the jam until it liquefies.

　　加熱果醬直至其液化。

　　I had two jam sandwiches.

　　我吃了兩個花生醬果醬三明治。

　　The bus was delayed in a five-mile jam.

　　公共汽車因長達(dá)五英里的交通堵塞而延誤。

　　Skim the scum off the jam and let it cool.

　　撇去果醬上的浮沫，讓它冷卻。

　　"Sorry Edward," I said, splattering the cloth with jam.

　　“對不起，愛德華，”我說道，把果醬濺到了桌布上。