butter是不可数名词。butter可作名词和及物动词两种词性，作为名词时，是不可数名词，基本含义有“黄油”、“奶油”、“牛油”；作为及物动词时，基本含义为“涂黄油于”、“给…抹上黄油”，引申义有“明白自己的利益所在”、“善于为自己打算”。

1、当butter作为名词时，是不可数名词，意为黄油;奶油。

例句：Fry the onions in butter.

用黄油炒洋葱。

First, melt two ounces of butter.

先熔好两盎司黄油。

Beat the butter and sugar; then blend in the egg.

把黄油和糖打好，然后调入鸡蛋。

Drain the pasta and toss it in melted butter.

把面条的汤控干，在溶化了的黄油里搅拌。

Margarine can be substituted for butter in this recipe.

做这道菜可以用人造黄油代替黄油。

I made a switch from butter to olive oil for much of my cooking.

我做饭的时候已经不怎么使用黄油，而是换成了橄榄油。

Beat the butter and sugar until soft and fluffy.

搅打奶油和糖直到松软为止。

Much as I like butter, I never eat much at a time.

尽管我喜欢奶油，但我从来都不一次吃很多。

If the temperature is too low the butter takes longer to form.

如果温度过低，奶油的制程时间将延长。

Butter can be produced by many forms of agitation.

奶油可以经由各种方式的搅动来取得。

2、当butter作为及物动词时，意为涂黄油于。

例句：She buttered four thick slices of bread.

她用黄油涂了四片厚面包。

She spread pieces of bread on the counter and began buttering them.

她把几片面包摆在台上，开始抹黄油。

These chaps know what side their bread's buttered on.

这些家伙知道怎样做对他们有利。