《Operating System Concepts》阅读笔记：p34-p40

《Operating System Concepts》学习第 7 天，p34-p40 总结，总计 7 页。

一、技术总结

1.virtualization(虚拟化)

(1)定义

A technology for abstracting the hardware of a single computer into several different execution environments, thereby creating the illusion that each environment is running on its own private computer.

2.distributed system(分布式系统)

(1)定义

A distributed system is a collection of physically separate, possibly heterogeneous computer systems that are networked to provide users with access to the various resources that the system maintains.

二、英语总结(生词：2)

1.escalate

(1)escalator: escalade(scala, "ladder") + -ator

c. a moving staircase(自动手扶梯，手扶电梯)。

(2)escalate: back-formation from escalator.

(3)escalation: derived noun from escalate.

vi/vt. to become greater. the root of escalate connects to the idea of "climbing" or "rising", which involved into the concept of increasing or intensifying sth progressively.

示例：However, a user sometimes needs to escalate privileges to gain extra permissions for an activity(《Operating System Concepts》第 34 页)。

2.illusion

(1)illusion: il-(a variant of "in") + ludere("to play")

c/u. a deceptive appearance or impression(幻觉).

示例：Virtualization is a technology that allows us to abstract the hardware of a single computer (the CPU, memory, disk drives, network interface cards, and so forth) into several different execution environments, thereby creating the illusion that each separate environment is running on its own private computer(《Operating System Concepts》第 34 页)。

关于英语的注解同步更新汇总到 https://github.com/codists/English-In-CS-Books 仓库。

三、其它

今天了解了 virtualization 的概念。

四、参考资料

1. 编程

(1) Abraham Silberschatz，Peter Baer Galvin，Greg Gagne《Operating System Concepts》：https://book.douban.com/subject/30272539/

2. 英语

(1) Etymology Dictionary：https://www.etymonline.com

(2) Cambridge Dictionary：https://dictionary.cambridge.org

欢迎搜索及关注：编程人(a_codists)