1 ADJ 一流的;极好的;最优的 If you describe something or someone as first-class, you mean that they are extremely good and of the highest quality. 一流的;极好的;最优的
2 ADJ [ADJ n] 甲级的;一等的;优等的 You use first-class to describe something that is in the group that is considered to be of the highest standard. 甲级的;一等的;优等的
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He officially announced his retirement from first-class cricket yesterday.
他昨天正式宣布退出甲级板球赛。
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Harriet graduated with a first class degree in literature.
哈丽雅特毕业时获文学一级学士学位。
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The Altea is a newly built first-class hotel.
阿尔特阿是家新建的高级宾馆。
3 ADJ [ADJ n] (车厢、船舱、机舱)头等的，一等的 First-class accommodation on a train, aeroplane, or ship is the best and most expensive type of accommodation. (车厢、船舱、机舱)头等的，一等的
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...a first-class carriage.
头等车厢
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He won himself two first-class tickets to fly to Dublin.
他为自己赢得了两张飞往都柏林的头等舱机票。
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...first-class passengers.
头等舱乘客
First-class is also an adverb.
First-class is the first-class accommodation on a train, aeroplane, or ship.
头等车厢(或船舱、机舱) 4 ADJ [ADJ n] (英)优先投递的，第一类的;(美)第一类邮件的(适用于信函和明信片) In Britain, first-class postage is the quicker and more expensive type of postage. In the United States, first-class postage is the type of postage that is used for sending letters and postcards. (英)优先投递的，第一类的;(美)第一类邮件的(适用于信函和明信片)
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Two first class stamps, please.
买两张第一类邮件邮票。
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The price of mailing a first-class letter will not be increasing this year.
今年一类邮件的邮费不会增加。
First-class is also an adverb.