1
cow dung be used as [noun]
表示用途时常用被动语态。
Cow dung is used as fertilizer.
牛粪被用作肥料。
牛粪
先理解核心含义，再看它在真实句子里的用法。
牛粪
the excrement of cows, often used as fertilizer or fuel
Cow dung is used as fertilizer.
牛粪被用作肥料。
常用作肥料或燃料
The farmer used cow dung as fertilizer for the crops.
农民用牛粪给庄稼施肥。
We stepped in cow dung while walking through the field.
我们走过田野时踩到了牛粪。
In some villages, cow dung is dried and used as fuel.
在一些村庄，牛粪被晒干用作燃料。
表示用途时常用被动语态。
Cow dung is used as fertilizer.
牛粪被用作肥料。
强调加工成形的用法。
Cow dung is made into fuel cakes.
牛粪被制成燃料饼。
强调收集的动作和目的。
Farmers collect cow dung for manure.
农民收集牛粪作肥料。
Not this
I saw a cow dung on the path.
Use this
I saw some cow dung on the path.
cow dung 是不可数名词，不能与不定冠词 a/an 连用，应使用 some 或零冠词。
Not this
The smell of cow's dung is strong.
Use this
The smell of cow dung is strong.
cow dung 是固定复合名词，不需要使用所有格形式 's，直接由 cow 修饰 dung。
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不可数名词，指牛粪这种物质
Dictionary facts from ECDICT.