恳请大神帮我翻译一下下，谢谢啦，无需机器译，要求：只要无语法问题和用词准确即可，在下在此谢谢啦！！
The additive model of the classic time series:
因经典时间序列中加法模型（1-4步与乘法模型一样所以从第五步开始写）
The additive model of the classic time series (Step 1 - 4 are the same with the Multiplicative model, so is starting to write from step 5)
第五步：趋势变化
因为是加法模型所以，计算剔除季节性变化的公式为（round(sales-seasonal index,2)的出来的。
Step 5: Trend variation
Because it is the addition model, so the results are form the calculation formula after taking away the seasonal factors :（round(sales-seasonal index,2).
第六步：
通过对剔除季节性的值进行画图得到其最佳离合线为（Tt=0.594X+21.884）
Step 6:
Use the value with the seasonal factors being taken away to draw a diagram and from which to obtain the best clutch line as （Tt=0.594X+21.884）.
第七步：预测
Step 7: Forecast
对第四年数据进行预测：
Carry out the forecast using of the 4th year's data:
通过带入第六步得出的最佳离合线来计算出Tt来，在用公式（Ft=round(Tt*St,2)）来计算出Ft。
Use the best clutch line that has been calculated after the step 6 to work out the value of (Tt) and use the formula（Ft=round(Tt*St,2)) to work out the value of (Ft).
第八步：（画出第四年预测销量和实际销量的图）
通过比较第四年的实际销售量线与预测销售量线是比较接近的。
Step 8: (Draw the diagrams of the 4th year's forecast sales quantity and the actual sales quantity)
Through the comparison of the 4th year's actual sales quantity line and the forecast sales quantity line, that they are actually rather close.
第九步：
通过公式round(（ft-at）/12,2)和round((ft-at)^2/12,2)计算出MAE和MSE的值。
Step 9:
Use the formula (（ft-at）/12,2) and the round((ft-at)^2/12,2) to work out the value of MAE and MSE.
第十步：
利用公式(=round((ft-at)^2/ft，2)算出(ft-at)^2/ft的值，当自由度为11，显著性水平为5%的卡方值为19.68.
Step 10:
Use the formula (=round((ft-at)^2/ft，2) to work out the value of (ft-at)^2/ft. When the degree of freedom is 11, significant level is 5% and the Chi-square value would be 19.68.
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