并列连词and,or,either...or,both...and,not only...but also,as well as
表转折对比,but,yet,however,nevertheless, not...but
表原因,for, because,since,now that,considering that,seeing that
结果,so,hence
从属连词,when,while,as,after,before,since,until,till,as soon as,once,
表条件,if even if,unless, in case
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