目前关于PCD的发病率不同文献的结果不同，也未见PCD危险因素的研究报道。
But there were respective results of PCD incidence in different literatures, meanwhile, there was no study to analyze risk factors of PCD.
不同文献资料对空气过剩系数计算方法的不同，在不少场合下造成了一些概念和数值上的混乱。
Different methods for excess air coefficient given in different literatures have made confusions in the concept and values of excess air.
但在不同文献中，对供应链管理研究内容及研究视角的观念各异，由此造成了SCM含义的模糊。
But in different articles, there are different research perspectives on SCM that makes the ambiguous of SCM definition.
但在不同文献中，对供应链管理研究内容及研究视角的观念各异，由此造成了SCM含义的模糊。
But in different articles, there are different research perspectives on SCM that makes the ambiguous of SCM definition.
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