The architect refines the system-level classes to design the business-layer interface.

架构师对系统层类进行改进以设计业务层接口。

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The identification of design-level classes (e.g., trees, stacks, queues, collections, etc.) should be deferred to a later discipline (i.e. design).

对于设计级别的类（诸如树、堆栈、队列、集合等等）可以在后面的阶段完成（如设计阶段）。

youdao

The XMS API provides a consistent programming model across multiple languages by offering a common set of high-level classes to perform messaging operations.

XMS API通过提供一套通用的、用于执行某些消息传递操作的高级类，实现了一个跨多语言的、一致的编程模型。

youdao

Today we tell you about one of the few prisons in America that offer college-level classes: San Quentin State Prison in California.

VOA: special.2011.07.07

And class size is pretty small if you go up to, you know, advanced level classes.

班级挺小的，如果，你知道，你去上高级课程的话。

要考入大学 - SpeakingMax英语口语达人

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

Under the current rules, this tax-free benefit applies to undergraduate and graduate level classes.

FORBES: Clearing Up Tax Confusion For College Savings Accounts

EdX, the nonprofit joint venture started last year by Harvard and the Massachusetts Institute of Technology, offers university-level classes free online and already has attracted more than 700, 000 people.

WSJ: Harvard Expands Reach in Asia

These small classes and lab work encouraged students to form tight friendships, but Mr. Holmes remained outside those inner circles for the most part, one person who took several upper-level classes with him said.

WSJ: Shooting Suspect's Behavior Provided Few Clues