The advanced drill technology and management mode adopted by UNOCAL Corp in Gulf of Tailand is of the first class level in the world and is worth for us to learn and refer to.

UNO CAL 公司在泰国湾埃拉温气田采用先进的配套钻井和管理模式技术进行钻井作业，具有当代国际上一流的钻井水平，值得我们学习和参考。

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First, we must work at the class and file level.

首先，我们必须处理类和文件层。

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The first level it will be taught as any other class in psychology or any of the classes you've taken here.

第一部分会和其他心理学,或者其他任何课程一样。

哈佛公开课 - 幸福课课程节选

Sreesanth has the nickname 'Prince of Hat-tricks' because of his exploits at club and first-class level.

BBC: Sri Sreesanth

An opener at first-class level, Hussey was called into the Test side as an injury replacement for Justin Langer.

BBC: SPORT | Cricket | International Teams | Australia | Hussey hopes for happy homecoming

Precheck members usually get to use security lines set up for first-class and elite-level frequent fliers.

WSJ: $100 to Fly Through the Airport