They refined crude oil into various petroleum products.他们将原油提炼成各种石油产品.ABout 90 % of the waxes in commerce are recovered by dewaxing petroleum.工业用蜡中约有90%是由石油中回收的.The petroleum exploration geologist working with subsurface...
本篇论文主要是研究白居易的讽谕诗.This essay mainly analyses the critical poems of Toi Yick.比如说书中所提到的李易的例子就是一种两难抉择.Li Yi's case, mentioned in Chapter 7 , presents such a dilemma.易的灵活性很强, 的确很强.This guy has mobility, real mobility....