求翻译：咖啡香精是具有咖啡香味特征的多种香味物质的混合物，其主要作用是给相应的食品提供咖啡香味，生成咖啡香味多样，咖啡味醇厚，香气逼真，可以赐予咖啡不同的风味特征和调味增香效果。本文介绍了咖啡香精的分类及其各自特性，重点阐述了热反应生成的原理,香味产生的主要途径、特征和各种应用，以及热反应生成工艺的发展和现状。是什么意思？

The coffee flavor is a mixture of coffee flavor characteristics of a variety of flavoring substances, whose main role is to provide coffee flavor to the food, to generate a variety of coffee flavor, full-bodied coffee flavor, aroma realistic, can bestow coffee flavor characteristics and seasonings i

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The coffee essence has the coffee fragrance characteristic many kinds of fragrance material mixture, its main function is provides the coffee fragrance to corresponding food, the production coffee fragrance is diverse, the coffee taste is mellow, the fragrance is lifelike, may grant the coffee diffe

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