翻译下列文字

Will "the second part of this bottom trend line theory through the elaboration, introduced this bottom trend line of the concept, basic form, the nonlinear regression Spss, the model is fitting. Their advantages and disadvantages were also described." Translated into English requirements accurately authentic

The second part of the trend line by the end of the exposition of theory, introduces the concept of the bottom trend line, the basic form, the application Spss the nonlinear regression fit of the model. And summarizes its advantages and disadvantages