氨的合成主要经过四道工序.There are four major steps in ammonia synthesis.试计算氮在尿素及硫酸氨的质量百分率.Calculate the percentage by mass of nitrogen in urea and ammonium sulphate.这种肥料经过化验表明氨的含量很高.Tests of the manure showed a high ammonia content...
Other projects came up and the emphasis of my work altered.突然来了一些其他的项目，我的工作重点便转移了。Computers allow the plans to be fine-tuned and to be altered quickly.计算机使得这些图样能够得到细调，并且可以迅速更改。The altered landscape looks unnatural and we...
The lorry driver escaped unhurt, but a pedestrian was injured.卡车司机安然脱险，但有一位行人受了伤。The driver managed to escape from the vehicle and shout a warning.那名司机设法从车里逃了出来并大声警告别人。The driver failed to negotiate a bend and ran into a...