The sentence consists of a main clause and a subordinate clause.
这
中有一个
一个
。
The sentence consists of a main clause and a subordinate clause.
这中有一个一个。
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，位在子要子之前
之后片语属子，也应以逗号隔开。
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