请在黑板上画一条垂直线。

Please draw a ___vertical line on the board.

在图表中，垂直轴显示销售数据。

In the graph, the ___vertical axis shows the sales data.

悬崖面几乎是垂直的，对攀岩者构成了挑战。

The cliff face was nearly ___vertical, posing a challenge for climbers.