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Unit 4 Breaking boundaries
1．Despite(prep.尽管) their advantages，most network-based systems are highly at risk
of(有……的风险) malicious(恶意的) attacks.
2．For instance，an attack on a power plant network could leave millions of individuals and
offices without electricity，while(conj.然而，而；用作并列连词，表示前后分句的对比)
attacks on social media networks can lead to exposure(n.暴露；揭露；曝光 expose v．暴露；
揭露；使接触) of user information.
3．To overcome the weaknesses of network-based systems，computer scientists worldwide have
been trying to develop(熟词生义：v.研发) advanced intrusion detection systems (IDSs)(入侵检
测系统) that could help to identify malicious attacks，increasing(现在分词作结果状语) a
network’s safety.
4．In recent years，machine learning (ML) algorithms(机器学习算法) have been found to be
particularly promising(adj.有前途的) for automatically(adv.自动地 automatic adj.自动的)
detecting attacks and intrusions on a network’s functioning.
5．Ideally，by(prep.通过，后常跟现在分词) analyzing large datasets，researchers should be
able to identify the most suitable features for solving a given task using ML tools，and this can
also be applied to(被应用在) intrusion detection.
6．This method was found to perform remarkably well when compared with(状语从句的省略)
other commonly employed feature selection techniques.
7．Beavers(海狸)，like humans，change their surroundings(环境) to fit their needs.
surrounding adj.周围的
surround...with...使……包围……
be surrounded with/by被……包围
8．But county officials were concerned about(关心，担心) how higher water would affect the
soil bank supporting Winston Path.
9．The whole audience burst out(突然爆发出) a wave of clapping almost every 30 seconds.
10．It was the first time that(这是……第一次……) she had been on the stage，so I couldn’t
blame her for any slip.
11．But the moment that surprised me occurred(发生)．
sth occurs to sb某人突然想到……
It occurs to/hits/strikes sb that...某人突然想到……12．Small and thin as the girl appeared(部分倒装)，the determined look on her face instantly
caught everyone’s eyes.
as/though引导让步状语时采用倒装的情况：
表语提前：Strange as/though it seems，it is true.
谓语动词提前：Try as he might，he didn’t pass the exam.
状语提前：Hard as I studied，I could not catch up with them.
13．Tears of joy(喜悦的泪水) misted my vision when the host announced she won first prize.
14．In 2020，the Nobel Peace Prize was awarded to the World Food Programme(WFP) for its
efforts to fight hunger，for its contributions to improving conditions(n.条件) for peace in
conflict-affected(adj.受到冲突影响的) areas，and for its efforts to prevent the use of hunger as a
weapon(n.武器) of war and conflict.
15．In emergencies(n.紧急情况)，it is often the first on the scene(到达现场)，delivering food
assistance to the victims(n.受害者) of wars，civil conflicts，earthquakes，and crop failures due
to natural disasters.
16．The WFP plays an important role(发挥着重要作用) in fighting hunger for world peace.
