求翻译：方法：于医巫闾山选择有代表性的不同高度重点地方，即山底、山中和山顶设三个固定调查点。以笼诱法进行种类分布，成蝇组成和季节消长调查。将诱获的成蝇，以敌敌畏毒死后，进行分类登记，并计算出月均虫只密度。是什么意思？

Methods: in Yiwulu Shan different highly focused select representative place, Hill end, Hill and mountain located three fixed points of inquiry. To cage trapping method for species distribution, fly into investigation of composition and seasonal fluctuation. To lure into flies, to dichlorvos after poisoned, a classification register, and calculate the average monthly pest density only.