double-valued ; binary ; diadic ; dyadic
浮点或者双精度浮点的内存空间是限定了的，所以某些值不能被表示。
The memory space of a float or double value is limited, so some values cannot be represented.
尽量尝试将您的扩展函数设计为仅使用双精度、字符串、布尔和节点集作为实参和返回值的类型。
Try to design your extension functions so that they use only doubles, strings, booleans, and node-sets as both arguments and return values.
本节讨论了双节点集群的几点：预备，假设和默认值。
This section discusses several prerequisites, assumptions, and defaults for two-node clusters.
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