Offer plots for time sequence. Apply the autocorrelation analysis such as correlogram from the residuals as well as the Ljung-Box test with lag eight. 如果对自己的观点不确定，通常可以说We tentatively state that 或The outcome may very well be brought on by / resulted from…… 到这一步你已经进行了研究，并且把发现的问题放到相关背景环境中进行了分析（即提供了背景信息），现在你需要做的是提供... http://introduction01245.blogzet.com/5-tips-about-introduction-you-can-use-today-25383923