mail consisting of printed matter qualifying for reduced postal rates
inexpensive accommodations on a ship or train
third-class的用法和樣例：
例句
用作形容詞 (adj.)
Among them,the top ones have fled to Shanghai,those of the second rank to Hankow,those of the third to Changsha,and of the fourth to the county towns. 他們中間，頭等的跑到上海，次等的跑到漢口，三等的跑到長沙，四等的跑到縣城。
用作副詞 (adv.)
I'll send the package first class. 我把這郵包按第一類郵件郵寄。
You'd better send this heavy letter by first class mail. 你最好把這封厚信按第一類郵件郵寄。
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