The KeyedFile class represents a system file that has access by key while the SequentialFile class represents a system file that has access by record number.

Keyed file类表示一个通过密钥访问的系统文件，而sequentialfile类表示一个通过记录编号访问的系统文件。

youdao

The hexadecimal number named jsessionid is the key to the Geronimo session handler and provides the system with information about you that at some time in the past you provided.

这个叫做jsessionid的十六进制数字是到Geronimo会话句柄的主键，并为系统提供了关于您的信息(您在过去某时提供的)。

youdao

The feasibility and the necessity of the state overhaul are expounded from the aspects of system forming, key number choosing and data bank software exploiting.

从系统组成、关键数字选择和开发数据库软件的技术现实性方面阐述了状态检修的可行性与必要性。

youdao

We own our own phone number, that allows you to input key strokes like you would any system and this is an example of what we call CS50 Voice.

我们都有电话号码，这就让我们可以输入任意的数字,然后这是CS50，Voice的一个例子。

哈佛公开课 - 计算机科学课程节选

The entrance uses a number pad instead of a lock-and-key system.

NPR: 'Future Home' Adds Ease to Living for Everyone