We shall have to refine on our methods of advertising.我们得进一步改进做广告的方法.The purpose of oil refinery is to refine crude petroleum.炼油厂的主要工作是提炼原油.Modern medical techniques refine on those of the past.现代医疗技术比过去的医疗技术要优越....
Local administrations grouped in a joint salvage effort.当地各管理部门联合起来协力挽救.Psychoactive substances are commonly grouped toare stimulants , depressants, or hallucinogens.刺激神经类物质通常分为兴奋剂 、 静剂和幻觉剂.The targets of these foreign (...