原文由 qingtian1210 发表:
2.accurately weighed by difference
这里by difference不知道是什么意思。
原文由 happyjyl 发表:
weigh by difference是减重称量。见英文释义:Weighing by difference is a way to weigh materials accurately. The weight of the material is the difference between the two weights of the vial before and after you transfer the material from the vial.
difference在这里是指两次称量的重量之差。见英文释义:The amount that remains after one quantity is subtracted from another.