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[求助]
英文不行的我表示压力很大 希望大家帮助英译汉
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When it reaches -10° C, he keeps it at this temperature for a couple of hours, then filters out the crystals. They are rinsed a couple of times with ether or another solvent such as hexane, then, while still wet with ether, added to a large flask or beaker containing 2000 ml of water. They are dissolved by stirring, then the flask or beaker is cooled down to 0° C by packing it in ice mixed with salt. When it reaches this temperature, 200 ml of glacial acetic acid is added to it with vigorous stirring. The chemist must make sure that the temperature does not go up more than a few degrees while he is adding it. filters the crystals off it and rinses them a few times with water. The crystals must now be kept moist in order for them to be turned into. In a 2000 ml flask, he puts 700 ml of concentrated sulfuric acid. It is cooled down to -10° C by packing the flask in a mixture of salt and ice, then magnetic stirring is begun. The crystals are slowly added to the sulfuric acid. They must be moist, or he will get a mess. It takes about an hour to add the crystals to the sulfuric acid. Once they are added, the flask is heated in a pan of boiling water and swirled around to dissolve the crystals. After they have dissolved, the flask is heated for a couple more minutes, then removed from the pan of boiling water. It is cooled down slowly to 0° C by first letting it cool down, then packing it in ice. chemist puts 1700 ml of water in a 3000 ml flask. Half of the sulfuric acid solution is added to it. It is heated in a pan of boiling water for a couple of hours. It is given a couple of good shakes every 15 minute |
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3楼2013-04-15 19:46:24
Rio2016
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When it reaches -10° C, he keeps it at this temperature for a couple of hours, then filters out the crystals. 当它达到-10° C，在这个温度保持两小时，然后滤掉结晶物。 They are rinsed a couple of times with ether or another solvent such as hexane, then, while still wet with ether, added to a large flask or beaker containing 2000 ml of water. 用乙醚或其他溶剂例如正己烷冲洗两次，然后，保持带有乙醚的湿的状态，并转移到一个带有2000ml水的大瓶或烧杯中。 They are dissolved by stirring, then the flask or beaker is cooled down to 0° C by packing it in ice mixed with salt. When it reaches this temperature, 200 ml of glacial acetic acid is added to it with vigorous stirring. 搅拌使其溶解，然后把瓶子或烧杯埋到冰盐混合物中使其降到 0° C 。当它降到这个温度，向里面加200 ml 冰醋酸，边加边搅拌。 The chemist must make sure that the temperature does not go up more than a few degrees while he is adding it. filters the crystals off it and rinses them a few times with water. 操作者必须保证，在添加的过程中不能使温度升高几度，滤去结晶物，用水冲洗几次。 文章不难、、自己试译下吧 |
2楼2013-04-11 21:25:01
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