There are two classes: input class and output class.
类别有两种：输入类和输出类。
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。
There are two classes of water brushes: watercolor brushes and airbrushes.
有两种类别的水刷：水彩笔和喷笔。
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。
Presently, there are two classes of cause that affect the coordination of the supply chain.
目前，供应链不协调的主要原因是“双重边际化”和“信息不对称”。
There are two classes of methods to overcome this short coming: resin barrier and coating barrier.
克服此缺点的方法分两大类：塑料阻融层及涂料阻融层。
This happens when there are two classes with the same name in the project, usually due to a copy and paste error.
发生这种现象的原因有两类具有相同名称的项目，通常由于复制和粘贴错误。
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。
There are two classes of security problems in distributed computing system, security of hosts and security of distributed applications.
分布式计算系统安全问题分为两大类：分布式计算的安全和主机的安全。
A means of grouping jobs that require the same set of resources for their execution. There are two classes: input class and output class.
一种作业的分组方法，这些作业在执行时要求相同的一组资源。类别有两种：输入类和输出类。
The five entry points are based on the approaches that have led to successful implementation of SOA for our clients. There are two classes of entry points.
这五个入口点基于已导致我们的客户成功实现了SOA的方法。
There are two classes of such medicines, 1) adamantanes (amantadine and remantadine), and 2) inhibitors of influenza neuraminidase (oseltamivir and zanamivir).
这种药物有两类：1）烷胺类药物（金刚烷胺和金刚乙胺），2）流感的神经氨酸酶抑制剂（奥司他韦和扎那米韦）。
There are at least two classes of these receptors, which have been designated A1 and A2.
这些受体至少有两类，分别被命名为A1和A2。
There are two math classes and an English class this morning.
早上有两节数学课和一节英语课。
There are two methods for adding classes to a page.
有两种在页面中添加类的方法。
There are two EJB classes in this application.
该应用程序中有两个EJB类。
There are really two classes of methods represented.
实际上有两类方法。
There are two main classes, Type I and Type II.
超新星有两类：I型和II型。
There are two primary classes in the Boost MPI library that you must learn: the environment class and the communicator class.
您必须了解BoostMPI库中的两个主要类：environment类和communicator 类。
In the TableStyles.jsp example, there are only two row classes, but the table has six rows.
在TableStyles. js p示例中，只有两个行类，但此表却有6行。
There are two main classes you'll want to examine to learn the programming model for these services: Membership and Roles.
有两个主要的类需要了解以学习这些服务的设计模型：会员类于角色类。
Once again proving there are two user classes on eBay: predator and prey.
再次证明有两个易趣用户类：捕食者和猎物。
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。
There are two ways in which classes can be loaded — explicitly or implicitly — with subtle variations between the two.
类装入的方式有两种——显式或隐式，两者之间有些细微差异。
There are two cases where the exchange of generated classes is required.
有两种情况需要交换生成的类。
There are two different classes of data types available on a system: base data types and derived data types.
在一个系统中有两种不同类型的数据类型：基本数据类型（basicdata type）和派生数据类型（derived datatypes）。
In object-oriented programming (OO) there are two pivotal concepts: classes and objects.
面向对象编程(object - oriented programming,OO)中有两个关键概念：类和对象。
Intel has long dominated the market for PC and server chips, but there are two other big classes of processors: those for high-end graphics and for mobile phones.
Intel长期主导个人电脑和服务器的芯片市场，但是还有两种不同类别的微处理器：一种是用于高端显卡的，一种是用于移动电话的。
There are two mechanisms: callback methods and callback listener classes. Here is an example of how you would write code to respond to a callback using callback methods.
这里有两种机制：回调方法和回调侦听器类。
There are two mechanisms: callback methods and callback listener classes. Here is an example of how you would write code to respond to a callback using callback methods.
这里有两种机制：回调方法和回调侦听器类。
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