短語詞組短語Integral first -order second moment method 積分一次二堦矩法First -order Second-moment Method 一次二堦矩法first -order second-moment theory 一次二堦矩理論mean value first -order second-moment method 均值一次二堦矩方法advanced first -order second-moment method 改進的一次二堦矩法adapted first -order second-moment method 改進的一次二堦矩法simplified first -order second-moment m ethod 簡化一次二堦矩法 返回 first-order second moment