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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Still, Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians, arguing that humans have produced local extinctions elsewhere.

克雷奇仍然认为古印度安人在灭绝上的责任即使不是主要的，也是次要的，他认为人类在其他地方造成了当地物种灭绝。

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