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- Six novel azobenzene derivatives were prepared by several synthetic steps using acetylaniline as initial material. 以乙酰苯胺为原料,经氯磺化、氨解、重氮化和偶联反应,合成了8个偶氮苯类化合物;
- Based on the above background, the rice hull which was cooked first was used as initial material and, then lignin/SiO2 composite was prepared primary coprecipitation at hydrothermal condition. 本论文基于上述背景，以稻壳为原料，先蒸煮稻壳，然后在水热条件下采取共沉淀法原位制备木质素/SiO2复合材料。
- Second method, p-fluoro aniline and chloroacetic chloride chloroacetyl chloride were used as initial materials and alkylation was carried out. 方法二以对氟苯胺和氯乙酰氯为起始原料，然后进行烷基化成环。
- Eight flavones were synthesized through acetylation、methoxyl protection、aldol condensation and closing ring used 1,3,5-trihydroxylbenzene and resorcin as the initial materials. 以间苯二酚和间苯三酚为原料,经乙酰化、甲氧基保护、羟醛缩合、关环4步反应合成了8种黄酮。
- The material is flawed throughout. 这种材料到处是裂缝。
- Using isovanillin and tyramine as the initial materials,racemic galanthamine was prepared in five steps including bromination,condensation and reduction,formylation, oxidation coupling and reduction. 以异香草醛和酪胺为主要原料,经溴化、缩合还原、甲酰化、氧化偶合及还原五步反应,合成了外消旋加兰他敏。
- He insists the condition to use the best material. 他坚持以使用最好的材料为条件。
- That material surpasses all others in fineness. 那种材料精良超过其他所有材料。
- The problem is how we are to get the raw material. 问题是我们怎样得到原材料。
- Jim is going to get material for a new book. 吉姆正打算为一部新书准备材料。
- The storm did a great deal of material damage. 暴风雨造成了大量物质损失。
- Radioactive ray is material thing. 放射线是实际的物质。
- His initial reaction was one of shock. 他最初的反应是震惊。
- The presentation of the material was untidy. 所提交的资料缺乏条理。
- The initial `h' in `hour' is not aspirated. hour一字中起首的h不发送气音。
- He covered the cushion with new material. 他给靠垫蒙上了新的料子。
- Is the material single width or double width? 这幅料子是单幅的还是双幅的？
- She's collecting material for a newspaper article. 她正在搜集素材在报纸上发表文章。
- The machine snarled the material up. 机器把材料搅在一起了。
- The start or initial stage; the outset. 开始，开端开始或初始阶段
