distillation是什么意思

英语翻译
oil
gasoline produced by simple distillation of crude oil or via conversion processes such as thermal or catalytic cracking contains a large variety of undesirable impurities
,which are different both in quality and quantity depending on the manufacturing process applied.the quantity varies between a few to sone thousand of parts per million.,and their influence on the properties of the gasoline may be quiet dissimilar.Examples of such impurities which are found in gasoline fractions and in particular in catalytically cracked material are:

Adjust the rate of heating to obtain a uniform distillation 怎么翻译

求化工专业英语大神来翻译这道题
liquid extration is uesd when distillation and rectification are difficult or ineffective.Close-boiling mixtures or substances that cannot withstand the temperature of vaporization,even under a vacuum,may often be separated by extraction.Extraction utilizes differences in the solubilities of the components rather than differences in their volatilities.sinces solubility depends on chemical properties,extraction exploits chemical differences instead of vapor-pressure differences.When either distillation or extraction may be used,the choices is usually disitillation,in spite of the fact that heat and cooling are needed.

这句英语怎么分析
The iPhone 5c is in many ways the distillation for what people love about the iPhone 5.what 在这里我不知是什么意思
还有这句It really is the only way that we believe provides the right experience.怎么两个动词在一起