例句與造句

1. Abstract : to settle the numbers of groups , the moth and features of group sampling are analysed , and its estimator is goven . then using cauchyschwartz unequility , it seeks the best apportion with finite cost
   文摘:為了確定分類抽樣的各類單位數(shù),分析了分類抽樣的抽取方法和特點,同時給出其簡單估計,然后利用柯西-施瓦茨不等式推導出在給定調(diào)查費用情況下的最優(yōu)分配
2. It's difficult to find finite costs in a sentence. 用finite costs造句挺難的