The clauses have different relations which are often denoted by correlatives.

各分句之间可以有各种不同的关系，常用关联词表示。

Some correlatives must be used together while others can be used independently.

有些关联词必须配合使用，有些可以单用。

Yet it does not appear to be true in all cases that correlatives come into existence simultaneously.

但是并非所有情况下，同时存在的相关事物能同时存在。

The quintessence of Comment on Ci and Poetry of Human World is "selfless states" also "describe objects in terms of objective correlatives" .

《人间词话》的精华“无我之境”即“以物观物”，体现了道家体道的人生境界。