main clause

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

这中有一个主和一个从。

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.

将附带说明放在逗号间规则，位在子主要子后片语从属子，也应以逗号隔开。