This paper gives a availability method based on Dependency -matrix that can find all primary attributes and get primary key.

就这类问题的子类给出了一种通过依赖矩阵求出全部主属性的方法，进而得出主关键字。

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One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.

对爆燃的主要特征之一，是火焰的速度大大低于音速的降低旅行。

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Furthermore, the fact that applying convolution operator is closed to inducting new attributes, just the time shifts of the primary attributes, is proved.

并证明了应用褶积因子相当于引入新的属性，只不过这列属性是原属性的时移。

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In addition to his fundraising prowess, Mr. Booker counts President Barack Obama as an ally, has high name recognition and is a Democrat in a solidly blue state all attributes that make him a formidable candidate, whomever he faces in a primary or general election, said Brigid Harrison, a political-science professor at Montclair State University.

WSJ: Senate Odds Reshuffled For Newark Mayor Booker