souped-up : adj. 增强了马力的;;加大了马力的,提高了效率的
Two days later Apple unveiled souped-up versions of its popular iPhone.
alpha and omega: n. 首尾始终全部主要成分重要因素
though China may not be the “alpha and omega” of the international process, it was close.
Jane Doe: 无名女士（诉讼程序中对不知姓名的女当事人假设的称呼）
used to refer to a woman whose name is not known or is kept secret, especially in a court of law
unknown unknown: 知与不知的四种之一。
There are known knowns. There are things we know that we know. There are known unknowns. That is to say, there are things that we now know we don’t know. There are unknown knows. That is to say, there are things that we do not know we know. But there are also unknown unknowns. There are things we do not know we don’t know.
watertight: 天衣无缝的，滴水不漏的
Thomson was shocked, but had a watertight alibi.
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