a conjunction such as ‘and', ‘or', ‘but', or ‘plus', that joinswords, groups, clauses of equal importance (coordinate clauses), and sentences. For example in the noun group ‘old men and women', ‘and' is a coordinating conjunction. In the sentence ‘Our team lost, but it was a great day out', ‘but' is a coordinating conjunction. 并列连词(如and, or, but, plus等)