她是个自尊心很强的人，绝不会自贬身份去写匿名信。She's got too much dignity to descend to writing anonymous letters.他们需要提升自己的形象——他们是在自贬身价。They need to improve their image — they are selling themselves short.不要自贬身份，不要学他们那样。Don't lower y...
The effect of acidity on synthesis of phenylbiguanide additive reaction of aniline with dicyandiamide was studied.研究了酸度对苯胺与双氰胺加成反应生成苯基双胍的影响.Major Composite of thc SeaIant is bisphenol A epoxy resin, dicyandiamide, ureido...