Do you know when to use an indefinite article?
你知道什么时候使用不定冠词吗?
We can't use the indefinite article with this noun.
我们不可以在这个名词前用不定冠词。
There are in English two articles: definite article and the indefinite article.
英语中有两种冠词: 定冠词和不定冠词.
Indefinite article : used to indicate that a thing is not identified as unique.
不定冠词:用于指定不特定不唯一的东西。
We do not use uncountable nouns in the plural and we do not use them with the indefinite article, a/an.
不可数名词没有复数形式,我们也不用不定冠词a/an修饰他们。

词典释义: