Since a function call is usually just a part of an XPath expression, an unknown function causes the execution of the entire XPath expression to fail.
由于函数调用通常仅仅是 XPath 表达式的一部分，未知的函数会造成整个 XPath 表达式的执行失败。
The thermal flux as an unknown function is obtained by minimizing the functional and solved with the equation of temperature function simultaneously.
将热流通量作为未知函数求泛函极值，并与温度函数联立求解。
One of the schemes adopts the integral equation with equivalent current as an unknown function, whereas the other USES the integral equation with total electric field as an unknown function.
一种方案采用以极化电流为未知函数的积分方程，另一种方案采用以总电场为未知函数的积分方程。
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