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first-class mail
头等邮件;一类邮件;一级邮件
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first-class ticket
头等舱的票
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first-class passengers
头等舱乘客
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a first-class ticket
头等舱机票;一等舱机票;头等舱车票
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first-class delivery
一流的快递员;一类邮件邮递业务量;一等邮寄
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a first-class operation
一流操作
 
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He'd like to book a first-class seat.
他想预订头等舱座位。
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The food was first-class.
这些食物是一流的。
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The car was in first-class condition.
当时车子处于最佳状态。
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They always stayed in first-class hotels.
他们总是下榻于最高级的宾馆。
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I know a place where the food is first-class.
我知道有一个品尝一流美食的地方。
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Could I have three first-class stamps, please?
请给我拿三张第一类邮件的邮票。