最后，jama也不是一个通用的数组类，相反，它主要关注于与矩阵数值计算相关的数学运算。

Finally, JAMA is not a general-purpose array class. Instead, it focuses on the principle mathematical functionality required to do numerical linear algebra.

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查询的结果在一个DocumentReference类数组中返回。

The results of the query are returned in an array of the DocumentReference class.

youdao

下面是另外一个技巧：Xdebug提供了一个增强型var_dump函数，它对于php数组和类尤为有帮助。

Here's one more tip: Xdebug provides an enhanced var_dump function that's especially helpful with PHP arrays and classes.

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