Each sample shall be independently determined twice by the method specified in this document. The average value of the two ...

（表语从句。时间状语从句） 52. Success is measured not by how much money you have made, but by how many people you have helped. 恒量成功的标准不是看你赚了多少钱，而是看你帮了多少人。（一般现在时被动语态。宾语从句。转折并列句） 53. Great works are performed not ...