以下为句子列表：
英文: If the determinant of the system of linear equations having n unknowns and n equations is not equal to zero, then the system of equations has one and only one solution.
中文: 含几个未知量几个方程的线性方程组的行列式，如不为零，则方程组存在一解且仅有一解。
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英文: Now, the new research efforts will aim to solve some of the biological unknowns behind these harmful processes, as well as defining the components and levels of polluted air that are most dangerous, and the length of time after exposure that we are vulner
中文: 现在，新的研究工作将致力于解开这些有害过程背后的未知的生物机理，此外还要界定污染空气中的哪些成份及何等含量是最危险的，人们接触污染多久之后就容易有病理危害。
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英文: The goal is to work out all the unknowns and nail down all the details before the first line of code is written.
中文: 目的就是为了在第一行代码写下前，将所有不明确的东西明确并细化下来。
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