它从浏览器接受请求，从业务逻辑层请求服务，生成表示并对浏览器做出响应。

It accepts the request from the browser, requests the service from the business logic layer, generates the presentation, and responds to the browser.

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因此，如果文本匹配了整个模式，第一组括号将生成表示一个正整数或负整数的的字符串，例如+ 49。

Hence, if text matched the entire pattern, the first set of parentheses would yield a string representing a positive or negative integer, such as + 49.

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在不提高抽象层次的情况下，工具可能自动地生成表示实体的可视化显示，也许甚至是在您同时在较高层次上工作的时候。

Tools may automatically generate visuals that represent entities without raising the abstraction level, perhaps even as you are simultaneously working at a higher level.

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