The questions, though very complicated, may be summed up as coming under three categories.
问题虽然复杂，归结起来不外三个方面。
Chemical composition of tobacco is very complicated, though more than 4,000 of components have been identified.
烟草的化学成分十分复杂，已鉴定出的成分就有4,000多种。
Though intra-personal communication is a very complicated process, it is found it can be abstracted the structure of an egg called "Egg-Communication Model".
本文研究发现，尽管人内传播是个非常复杂的过程，但还是能够抽象、简化出一种类似鸡蛋结构的“蛋式传播模式”。
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