The sentence consists of a main clause and a subordinate clause.
这
有
个主和个从。
The sentence consists of a main clause and a subordinate clause.
这有个主和个从。
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号之间
规则，位在
主要之前或之后片语或从属，
应以逗号隔开。
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