是一个名词或名词词组，描述名称的主题和重点。

Are a noun or noun phrase which describes the subject and main focus of the name.

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名词与名词词组、名词词组与名词分句之间的结构联系是分别通过扩展和紧缩这两种对立的方式实现的。

The structural relationship between noun and noun phrase, and noun phrase and nominal clause is carried out respectively by the opposite means of expansion and condensation.

youdao

施事可以是专名、不定的名词词组、非生物性名词词组，同样也可以是动名词和从句。

Agents can not only be proper nouns, indefinite noun phrases, unanimated noun phrases, but also be gerunds and clauses.

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