Click on the trend line to see the information in the status bar. For a category chart (for example a line chart), the regression information is calculated using numbers 1, 2, 3, … as x-values. This is also true if your data series uses other numbers as names for the x-values. For such charts the X-Y chart type might be more suitable.
对于分类图表（例如折线图），数字 1,2,3,... 作为 x 值来计算回归信息。如果您的数据序列使用其它数字作为 x 值的名称也是正确的。对于这样的图表 XY 图表类型可能更合适。