The sentence consists of a main clause and a subordinate clause.
这
中有一个主和一个从。
The sentence consists of a main clause and a subordinate clause.
这中有一个主和一个从。
Similar in principle to the enclosing of parenthetic expressions between commas is the setting off by commas of phrases or dependent clauses preceding or following the main clause of a sentence.
类似将附带说明放在逗
之间
规则，位在子主要子之前或之后片语或从属子，也应以逗
。
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