1·The sides of the mountain are almost perpendicular.
山的两侧几乎是垂直的。
—— 《柯林斯英汉双解大词典》
2·What she's going to do is to start loading up the electrons, and you see this wand here move slowly, and start become perpendicular.
她要做的是开始加载电子，你可以看到这个棒子移动得很慢，并开始变得垂直了。
3·Let AB be perpendicular to CD.
设ab垂直于CD。
—— 《新英汉大辞典》
4·The researchers found that if they stretched out the substance in a second direction perpendicular to the first, it could then be stretched in any direction without harm.
研究人员发现，如果向着第一次拉伸的垂直方向拉扯，它仍然能够向着任何方向毫无损害地任意伸展。
5·A severe facade rose above this door; a wall, perpendicular to the facade, almost touched the door, and flanked it with an abrupt right angle.
大门的上方便是那房屋的正面，气象庄严，一道和房屋正面垂直的墙紧靠在大门旁边，构成一个生硬的直角。