He'd like to book a first-class seat.

他想预订头等舱座位。

The food was first-class.

这些食物是一流的。

The car was in first-class condition.

当时车子处于最佳状态。

They always stayed in first-class hotels.

他们总是下榻于最高级的宾馆。

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。

Could I have three first-class stamps, please?

请给我拿三张第一类邮件的邮票。