Structurally, they are simple sentences, compound sentences, complex sentences and compound-complex sentences.
按照句子的内部结构进行分类时，可分为简单句、并列句、复合句和并列复合句。
Vary sentence structures by blending simple, compound, and complex sentences.
也可以用简单、复合或者复杂句来增加句子结构的种类。
Any expression which is used to build up a compound sentence out of simpler sentences will be called a sentential operator, because it "operates" on sentences to produce more complex forms.
任何一个用于从简单句子构成复杂句的表达项称为一个句子运算符，这是因为它在句子上进行“运算”以产生出更复杂的形式。
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