报道以呋喃甲醛和苯乙酮为原料,氢氧化钠为催化剂,采用超声波辐射合成糠叉乙酰苯的方法.With furfural and acetophenone as raw materials - furfurylideneacetophenone was synthesized by NaOH as catalyst under ultrasonic irradiation....
A proton is an elementary particle of matter.质子是物质的基本粒子。an elementary English course基础英语课程Their course of study includes elementary hygiene and medical theory.他们的课程包括基础卫生学和医疗知识....
短暂的休息后，乐队继续演奏他们的曲目。The band continued with their set after a short break.在他短暂的一生里，他只出版过3卷薄薄的诗集。He published only three slim volumes of verse in his short life.经过短暂的反弹后，股价回落到了126便士。After a brief rally the shares returned ...
As we travel south, the countryside begins to undulate as the rolling hills sweep down to the riverbanks.我们一路南行，乡间开始变得起伏不平，绵延的山峦一直延伸到河岸。To undulate more freely, keep you hands about shoulder width apart.要波动的更自由些, 保持你的手与肩...