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experimental
a.实验性的
The project is still in its experimental stages and won't be put in practice until a year later.
该计划仍处于实验阶段，要到1年后才会付诸实施。
aware
a.知道的；察觉的（与介词of并用）
You should always be aware of your surroundings.
你随时要了解周遭的环境。
Mary was aware of Tom's bad intentions, so she refused to go out with him.
玛丽察觉出汤姆不怀好意,所以拒绝和他约会。
awareness
n.意识；察觉
The government is trying to raise public awareness about environmental protection.
政府正设法提高民众的环保意识。
The purpose of this ad is to raise awareness about the importance of environmental protection.
这则广告的目的在唤醒人们环保的重要性。
security
n.安全
Many workers see the policy as a major threat to their job security.
许多员工都认为这项政策是他们工作保障的一大威胁。
considerable
a.相当大的
The rice crop suffered a considerable damage as a result of the typhoon.
由于这场台风,稻米作物遭受相当大的损失。
considerably
adv.相当大地,颇为
The design of the car was considerably modified.
这辆车的设计被大幅修改。
skyscraper
n.摩天高楼
Almost all big cities have skyscrapers.
几乎各大都市都有摩天大楼。
replace
vt.取代
I’m considering replacing my old PC with a notebook.
我正考虑把旧的个人电脑换成一台新的笔记本电脑。
replacement
n.替代人选,替代品
We need a replacement for the typist who left last week.
我们需要一个人来接替上周离职的打字员。
conclude
vi. vt.作结论，结束；断定
The professor concluded his lecture with a joke.=The professor ended his lecture with a joke.=The professor wrapped up/wound up his lecture with a joke.
该教授讲了一个笑话便下课了。
We finally concluded that the accident was caused by his carelessness.
我们最后认定这次意外是他的粗心造成的。
