first class
in sing.
1- a set of people or things grouped together as the best第一流的人物（或事物）：
the first class of the orders of chivalry.
第一流的骑士团。
1.1
- mass noun the best accommodation in a plane, train, or ship（飞机、火车、轮船的）头等舱：
a seat in first class.
一个头等舱座位。
1.2
- Brit. the highest division in the results of the examinations for a university degree〈英〉（大学学位考试成绩的）优等。
1
- of the best quality or in the highest division第一流的（地）, 一级的（地）, 甲等的（地）：
as adj. the hotel offers first-class accommodation.该酒店提供一流的住处。
1.1
- of or relating to the best accommodation in a train, ship, or plane（火车、轮船或飞机的）头等舱的：
as adj. a first-class carriage头等车厢
as adv. you can travel first class on any train.你可以乘坐任何一列火车的头等车厢。
1.2
- of or relating to a class of mail given priority（邮件）优先投递的, 第一类的：
as adj. first-class mail第一类邮件
as adv. send it first class.作为第一类邮件寄发。
1.3
- as adj. Brit. of or relating to the highest division in a university examination〈英〉（大学考试）一等的, 甲等的：
a first-class honours degree.
甲等成绩学位。
1.4
- (of cricket) played between sides of recognized stature and with matches of two innings per side（板球）甲级赛.