Could I have three first-class stamps, please?

请给我拿三张第一类邮件的邮票。

《牛津词典》

SOA provides flexibility primarily through its three first-class constructs: services, components (that realize the services), and flows (or processes).

SOA主要通过其三个一流的构造来提供灵活性的：服务、组件(实现服务)和流(或流程)。

youdao

There were three eliminations in the first round of the competition.

比赛第一轮淘汰了三个队。

《牛津词典》

In nineteen seventy-three, Ashe was the first black player to be invited to compete in the South African Open.

VOA: special.2010.02.07

When I reflect on the first couple of years of Baidu's operation, I think there are three things that's very critical.

当我回想百度最初的那几年，有三件事是非常重要的。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

Scholars have proposed three possible models to explain the formation of Israel. The first is an immigration model.

学者们提出了三种可能的模型,来解释以色列的形成，第一种是移民模式。

耶鲁公开课 - 旧约导论课程节选

The three first rank macroeconomic variables critical to economic growth are monetary, tax, and regulatory policy.

FORBES: The Business Cycle Throws The GOP A Curveball

Murty has featured in three first-team pre-season matches including the 3-0 victory over Hearts at St Mary's.

BBC: Murty completes Southampton move

None of the teams making the first 32 selections went for Te'o, not even Minnesota, which had three first-round picks.

NPR: Bring On Beef In Draft, Starting With OT Fisher