这是一个可用来创建单例类实例确不需要为每个特定的类重写单例模式代码的可重用的类。

This is a class that can be used repeatedly to instantiate a class as a singleton without having to re-write the singleton pattern code for that specific class.

youdao

您自己来做响应确认通常要比依赖于 DTD 或 XML 模式代码做响应确认要快的多。

Validating the response yourself will normally be much faster than depending on the DTD or XML schema code to validate the response.

youdao

在转换最内部的地方，expression被转换成一个列表，并作为普通的模式代码进行分析。

In the innermost part of the transformation, expression is converted to a list representation and is evaluated as normal scheme code.

youdao

And in particular, I can then ask the following question, which is, what's different between those two pieces of code?

是有个明显的模式的,我特别要问如下的问题，这两块代码的,不同之处在哪儿？

麻省理工公开课 - 计算机科学及编程导论课程节选