The historian drew a horizontal line on the date to remember it.
历史学家在日期上画了一条水平线来记住这天。
First, draw a horizontal line.
首先，画一条水平线。
Draw a horizontal line across the bottom of the page.
在此页底部画一条水平线。
Once a horizontal line is all one color, it will disappear.
一旦水平线是一种颜色，它会消失。
Once a horizontal line is all one color, it will disappear.
一旦水平线是一种颜色，它会消失。
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