向上或向下 meaning in English

uor down

The airplane must be guided, or steered, so that it will not only go left or right, but also up or down .
飞机必须被制导，即被驾驶，使它不仅可向左或向右而且也可向上或向下飞行。
An ascending or descending part ; an incline
斜面向上或向下倾斜的部分；斜坡
Lets you move up or down based on your needs
允许根据需求向上或向下移动。
If necessary , you can scroll the page up or down
如有必要，可以向上或向下滚动页面。
Event occurs only when you click the up or down arrows
仅当单击向上或向下箭头时才发生

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