服务发现的最简单形式是从服务提供者处请求一个服务描述的副本。
The simplest form of service discovery is to request a copy of the service description from the service provider.
在如今的博物馆里可以找到十六世纪教师使用的许多经典文本的副本，包括描述基于文本的口语课程的旁注。
Copies of many of the classical texts used by sixteenth-century teachers, including marginal notes describing the oral lessons that were based on the texts, can be found in museums today.
当某个进程复制它自身时，内核生成所有打开的文件描述符的副本。
When a process duplicates itself, the kernel makes a copy of all open file descriptors.
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