In America there are two classes of travel-first class, and with children.

在美国，旅行有两种等级——头等，以及带着小孩儿的。

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Let us consider a scenario in which there are two classes of traffic, gold and bronze.

我们来考虑一个场景，其中有两类请求流，gold和bronze。

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You probably already know that there are two classes of interfaces for parsers: object-based and event-based interfaces.

您可能已经知道语法分析器有两类接口 - 基于对象的和基于事件的接口。

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There are two classes, two broad classes of drug sort of type ligands that are defined, agonists and antagonists.

这样的配体药物有两类,目前已经明确的配体药物大体上分为两种,分别是激动剂和拮抗剂

耶鲁公开课 - 生物医学工程探索课程节选

On one level, there are things like companies that have two . different classes of stock that are economically identical.

一方面，我们有这样的例子，有的公司拥有两种,不同类别的股票，他们在经济意义上是相同的。

耶鲁公开课 - 金融市场课程节选

There are two general classes of molecules that are produced by the endocrine system.

内分泌系统产生的分子通常有两类

耶鲁公开课 - 生物医学工程探索课程节选

We are entering a period where there will be two classes of investors: those who have access to enhanced due diligence intelligence and those who rely upon traditional avenues of information.

FORBES: Emerging New Fiduciary Trends and Developments: Systems of Mass Deception vs. Systems of Enhanced Diligence (September 1, 2003)