This is also true to appositive prepositional phrases.

当其充当同位语时，亦可省略。

This case, the appositive clause is relatively simple.

这种情况下，同位语从句都是比较简单。

Appositive phrases are nouns or pronouns with modifiers.

同位词组为修饰词语的名词或代名词。

Chapter two discusses an appositive phrase composed of two nouns.

第二章探讨由两个名词构成的同位短语。

An appositive clause explains a noun, or shows the meaning of a noun.

同位语从句对名词进一步解释，说明名词的具体内容。