未知函数不受FC方式的保护，需要明确预防粗心大意的执行。
Unknown functions are not guarded by FC mode; they require explicit guards against their inadvertent execution.
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。
The thermal flux as an unknown function is obtained by minimizing the functional and solved with the equation of temperature function simultaneously.
采用重心有理插值近似未知函数，得到未知函数的各阶微分矩阵。
The differentiation matrices of unknown function are constructed by using barycentric rational interpolation.
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