main clause

1.The sentence consists of a main clause and a subordinate clause.

这中有主和从。

2.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，也应以逗号隔开。