在句子'狗在跑'中，'狗'是一个名词。

In the sentence 'The ___dog is running', 'dog' is a ___noun.

在句子中，名词通常用来指代人、地点或事物。

In a sentence, a ___noun usually refers to a person, place, or thing.

“勇气”和“正义”都是表示抽象概念的英语名词。

"Courage" and "justice" are ___nouns representing abstract concepts in English.