英语语法分析

There have been some reports on gas chromatographic analysis of triamine mixtures at home and abroad.

关于三胺混合物的气相色谱分析，国内外已有一些报导。

The successful synthesis of the aromatic triamine containing pyridine ring laid an important foundation for preparation of a novel hyperbranched polyimide.

这种新型含吡啶环芳香三胺单体的成功合成将为一类新型超支化聚酰亚胺的制备奠定重要的基础。

The macrocyclic triamine compounds are very important compounds. But it is extremely difficult to synthesize these compounds because of low yield and numerous steps.

大环三胺类化合物是一类非常重要的化合物，但其合成比较困难，存在合成步骤多、产率低等问题。