A black line sets the corresponding line of the selected cells. The line is shown as a dotted line when you choose the 0.05 pt line style. Double lines are shown when you select a double line style.
以黑色线条设置选定单元格的相应线条。。如果选择 0.05 pt 线条样式，此线条将显示为虚线。如果选择双线样式，将显示双线。