我要上四节课。
He enrolled in four classes during his first semester at TCU.
小休伊第一学期就选报了四门课。
For example, Listing 1 shows four classes that all implement the Math interface.
例如，清单1显示了四个均实现Math接口的类。
The product is divided into four classes: earrings, cups and feng, picture frames.
产品共分四类：耳环、杯子、笔筒、相框。
We are busy every day. We have four classes in the morning, and two in the afternoon.
我们每天都很忙。我们上午有四节课，下午两节。
We have only four classes left. Do come to the class in the last four classes. Thanks!
我们只剩下四次课了。请同学们最后的这四次课务必来上课。谢谢！
There are four classes: identifiers, keywords, operators and delimiters, and literals.
分为四类：标识符、关键字、运算符和分隔符 和 直接常量。
Because eof his alcohol problem, he flunked out of three out of four classes last term.
他因酗酒问题，上学期四门功课有三门不及格。
We come to school at seven. We have four classes in the morning and two in the afternoon.
我们七点到学校。我们上午有四节课，下午两节。
We usually have a morning class and four classes in the morning, four classes in the afternoon.
我们通常有一个早晨上课，早上上四节课，下午上四节课。
There are four classes of seaweeds—green, brown, red, and bluegreen—and they’re all packedwith healthful nutrients.
海藻有四种分类——绿藻，褐藻，红藻和蓝绿藻，它们都充满了健康的营养物。
According to the function and characteristic, paper cut-out is sorted into four classes:(1) Basic structure pattern.
首先针对计算机剪纸纹样的功能和特点，把纹样分为四类：（1）基本结构纹样；
In this paper, the maximum principles for solutions of four classes of semi-linear ellipic equations are established.
文章主要建立了四类四阶半线性椭圆型方程解的极大值原理，并得到了相应边值问题的解的唯一性定理。
XDoclet is a tool that lets you write only a single class for EJB for database access instead of a minimum of four classes.
XDoclet是一个非常有用的工具，使用这个工具您只需要为访问数据库的EJB编写一个类即可，而不用编写4个类。
NOTE: the source code for the four classes is provided as a file in the Downloads section of this article. The files names are as follows.
注意：本文的下载小节以文件形式提供这四个类的源代码。
This series with a top speed of 120km/h has more stops than the T ones. They are equipped with air-condition and the four classes of berths.
这类车次的最高时速是120公里，比T字开头的火车要多停几站。有空调，设有四种等级的席位。
The transaction package contains all of the transaction management classes, including the four classes that represent the core transaction processing.
Transaction包中包含所有事务管理类，包括四个表示核心事务处理的类。
The events causing state transitions are classified as four classes: System Event, which includes data communication and command from teacher's station;
把引发状态转换的事件分为四类：数据通讯、教师台操作等系统事件；
We have four classes in the morning and two in the afternoon. After classes, we join in various activities, such as ball games, painting, singing and dancing.
我们上午有四节课，下午两点。课后，我们参加各种各样的活动，如球类运动、绘画、唱歌和跳舞。
For an arbitrary polyhedral graph, four classes of polyhedral links can be obtained by applying the operation of 'x-tangle covering 'to the related reduced sets.
对任意一个多面体图，四类多面体链环可以通过应用‘X -缠绕覆盖’到相关的简化集中得到。
One writer suggests grouping games into four classes depending upon the elements of competition, chance, mimicry, or vertigo (motion alone, i. e. , teeter-tottering).
一位作家建议根据竞争、博彩、模仿和平衡（如跷跷板等运动）的要素将游戏分成四类。
Thirdly, in view of spatial hierarchy, urban recreation space always includes four classes: block recreation, community recreation, district recreation and urban recreation.
从空间层次上来看，城市游憩空间一般来说包括四个层级，即小区游憩、社区游憩、城区游憩和城市游憩；
Mr. Liu said four classes of English have to be held concurrently, and since there are only three teachers in the department including himself, I'll have to take over one section.
刘先生说四组英文应当同时间上课的，系里连他只有三个先生，非我担任一组不可。
The degrees of soil liquefaction are divided into four classes according to liquefaction index, and the corresponding relations between liquefaction indexes and seismic hazards are given.
按液化指数把液化程度分为四级，并给出液化指数和震害的对应关系。
The existing image tracking algorithms can be categorized into four classes: model matching based method, motion information based method, filtering based method and classification based method.
现存的图像跟踪算法主要分为基于模板匹配的算法，基于运动信息的算法，基于滤波的算法和基于分类的算法。
After having taught fifth-grade classes for four years, I decided to try at all costs to rid them of their fear and dislike of books.
在教了四年五年级的课之后，我决定不惜一切代价消除他们对书籍的恐惧和厌恶。
I missed four chemistry classes.
我旷了四节化学课。
I missed four chemistry classes.
我旷了四节化学课。
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