dimethylamino-pyridine,a kind of high acylating catalyst,is synthesized in two steps with pyri-dine as raw material, and ethyl acetate as nontoxic solvent.是什么意思_dimethylamino-pyridine,a kind of high acylating catalyst,is synthesized in two steps with pyri-dine as raw material, and ethyl acetate as nontoxic solvent.在线翻译_英语_读音_用法_例句