Day 219
knock out「摧毁，破坏」
朗文字典解释：
to damage something so that it does not work

权威字典例句：
The air raids were planned to knock out communications on the ground.
空袭的目的是为了摧毁地面的通讯系统。

外刊例句：
Embedded in an innocuous piece of tax software, the virus, which the American government said had the Kremlin’s fingerprints all over it, struck Ukraine in June 2017, knocking out fed eral agencies, transport systems, cash machines—even the radia tion monitors at Chernobyl, the husk of a nuclear power station.
——来自经济学人二月刊Cyber-rattling
病毒被嵌入一款无害的税务软件中，米国政111府认为这件事情与克姆林宫密切相关，2017年6月，该病毒袭击了Ukraine，摧毁了其联邦机构、运输系统、提款机——甚至是切尔诺贝利的辐射监视器，即其核电站的外壳。

#寻章摘句#
看到一首Radia Perlman的一首诗，她是美国的一个程序员，发明了STP，从树的形态得到灵感。

树是最美的一张图表。

Algorhyme

I think that I shall never see

A graph more lovely than a tree.

A tree whose crucial property

Is loop-free connectivity.

A tree which must be sure to span

So packets can reach every LAN.

First the root must be selected.

By ID it is elected.

Least cost paths from root are traced.

In the tree these paths are placed.

A mesh is made by folks like me

Then bridges find a spanning tree.

#G.O.S.S.I.P带你看世界# 是ACM CCS iMentor workshop 的传单，希望鼓励身边做cybersecurity research 的研究生参加（女生或其它underrepresented的学生）[赢牛奶]世界各地的学生都可以报名啊[赢牛奶]美国NAE院士Radia Perlman给keynote[赢牛奶]这次CCS和iMentor workshop的时间会便于亚洲国家参加[好喜欢]所以不用熬夜[阴险]