It allows the system to answer questions about what was known at a certain point in time about a fact at another moment.
它使系统可以回答在某一特定时间点，对于在另一时刻的事实，系统知道什么的问题。
The key point in style reproduction in literary translation is to retain the stylistic value carried in a certain expression when we translate it into another language.
这是因为一些传统的翻译理论有时候无法解决文学翻译中出现的问题，而借助于文学文体学的研究成果，译者可以做到正确把握和再现原文风格。
If a candidate is weak in one area, a strength in another can help offset to a point, but applicants must meet a certain threshold in all three to be admitted.
如果申请人在某一方面比较弱，那么就必须有另一方面非常突出的成绩来弥补，但是申请者的三个方便都必须达到一定的衡量标准。
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