《Operating System Concepts》学习第 62 天，p735-p737 总结，总计 3 页。

一、技术总结

1.distributed system

(1)定义

A collection of loosely coupled nodes interconnected by a communication network(一组通过通信网络相互连接的松散耦合节点)。

(2)打造分布式系统的原因

resource sharing、computation speedup、reliability。

2.network structure

local-area networks (LAN)、wide-area networks (WAN).

二、英语总结(生词：3)

1.interconnect

(1)interconnect: inter-("between, among") + connect

vi/vt. connect with each other.

(2)示例

To completely understand the roles and types of distributed systems in use today, we need to understand the networks that interconnect them(《Operating System Concepts》第 735 页)。

(3)connect vs interconnect

1)connect is used for two object.

2)interconnect is used for multiple objects.

2.emerge

(1)emerge: e-("out") + mergere("to dip, sink")

vi. emerge literally means "to rise out from liquid", appear(出现)。

(2)示例

Local-area networks emerged in the early 1970s as a substitute for large mainframe computer systems(《Operating System Concepts》第 736 页)。

3.ubiquitous

(1)ubiquity: ubi-("where") + -quity("a suffix indicating state or quality")

u.the fact of being everywhere。

(2)ubiquitous: ubiquity + -ous

adj. being everywhere("无处不在")。

(3)示例

WiFi is now ubiquitous and either supplements traditional Ethernet networks or exists by itself(《Operating System Concepts》第 737 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

近来感冒，头痛欲裂，不想看书。

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

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