英语语法分析

Three unknown neutral thiosemicarbazone derivative receptors were synthesized in good yields.

利用简便的方法设计合成了三种缩氨基硫脲衍生物受体分子。

A new method for the spectrophotometric determination of trace copper with 2,4 dihydroxybenzaldehyde thiosemicarbazone(DBT) is reported in this paper.

研究了新显色剂2 ，4 二羟基苯甲醛缩氨基硫脲（DBT ）与铜的显色反应，建立了光度法测定微量铜的新方法。