用逗号将长的介绍性的从属分句和短语(四个或更多单词)分开。
Set off long introductory dependent clauses and phrases (four or more words) with a comma.
这些从属分句和短语不包含句子主语和谓语，不能单独组成句子。
These clauses and phrases do not include the subject and verb of the sentence, and they cannot stand alone as complete sentences.
在英语语法著作中，都有专门的章节阐述所谓的复合句、包括从属分句和领句。
In any English grammar textbooks, there are certain chapters analyzing complex sentences and its subordinate clause and main clause.
每个分句都有自己的主位结构，该结构还可能从属于其上层分句。
Each clause has its own thematic structure, which may be subordinate to a larger thematic structure.
每个分句都有自己的主位结构，该结构还可能从属于其上层分句。
Each clause has its own thematic structure, which may be subordinate to a larger thematic structure.
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