化学专业英语解析分析.ppt

The article and analysis The second group 2013-11-11 About：methanol as the fuel of engine 关于：甲醇做为发动机的燃料 The high-compression direct-injection spark-ignition methanol-fueled engine combines the advantageous features of the spark-ignition engine and the compression-ignition engine. It injects the fuel directly into the combustion chamber during the compression process and ignites the fuel as it mixes with air,enabling direct control of the ignition process with a spark plug.?Therefore, such a methanol-fueled stratified charge engine avoids the spark-ignition operation to require a high? anti-knock fuel and the compression-ignition operation to require an ease ignitable fuel. On the other hand, with the advanced injection timing, smoke opacity,UHC and CO emissions diminished, and NOx and CO2 emissions boosted at all tests distinguish （单词辨析） ignite, fire, inflame, kindle, light v.(动词) 这组词的意思都与“燃烧”有关。其区别是： 1.fire多用于口语中,表示迅速燃烧起来,并产生通红的颜色; light是普通用语,指发光或发热; kindle指需较长时间或事先要做一定准备方能点燃。例如: Someone fired the building.有人放火烧了那栋楼房。 She lighted the candles.她把蜡烛点燃。 The spark kindled the dry wood.火星燃着干柴。 2.ignite多用于科技方面,指来势凶猛的燃烧,或与易燃物接触后所引起的燃烧; inflame则多用于文学作品中,指激起强烈的感情。例如: Spontaneous combustion ignited the heap of oil-soaked rags in the basement.自燃使得地下室渍油的破布堆燃烧起来了。 Her question seemed to inflame him all the more.她的问题似乎使他更加恼火 kindle ,fire, ignite [?ɡ?na?t] , light这些动词均含“点燃、着火”之意。 kindle:指艰难或缓慢地把可燃料点燃，可用于比喻。 fire普通用词，指将某物点燃使其燃烧起来，火势可大可小。 ignite:多用于科技文体，指使某物受热直到燃烧或发光，也可指用火花使易燃物迅速燃烧起来。 light:普通用词，指点燃易燃物，使其能发光，满足各种需要。 distinguish diminish, decrease, lessen, reduce 这组词都可表示“降低”或“减少”。其区别在于:decrease指各种事物逐渐减少、逐渐衰弱的过程; lessen指减轻强度和减缓烈度,也可指从整体上减去部分或在程度上、数量上的减少; diminish指可以看得出的“缩小”“缩减”; reduce指缩小事物的范围、强度、数量等,也可指级别、地位或经济条件的降低。例如: Decrease the dose of medicine when you feel better.你感到好些就减少药剂用量。 The number of fighters had now diminished to two, but the hilltop remained in our hands.现在战士只剩下两个人了,但我们仍然占领着山头。 Good lubrication will reduce friction.良好的润滑会减少摩擦。 The noise lessened as the plan