Just draw a vertical line down the middle of a blank page.
拿出一张空白的纸，在中间画一条竖线。
Draw a vertical line down the center of your notebook paper.
在笔记本的一页的中间划一条竖线。
Step 6: From this point draw a vertical line down to the horizontal axis.
步骤6：从这一点划垂线向下与横轴相交。
Step 6: From this point draw a vertical line down to the horizontal axis.
步骤6：从这一点划垂线向下与横轴相交。
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