This sentence includes two coordinate clauses.

这个句子包含两个并列分句。

A sentence of two or more coordinate independent clauses, often joined by a conjunction or conjunctions, as the problem was difficult, but I finally found the answer.

包括两个或多个并列句的句子，通常是由一个或几个连词连接，例如虽然问题非常难，但我最终还是找到了答案。

There is another case where "and" appears between every two coordinate members in a sentence-it is known as polysyndeton in the rhetoric.

有一种情况是，它们出现在所有并列成分之间，这在修辞学上称作连词叠用。