late 15c., from adverb (late 14c.), from Old French perpendiculer, from Latin perpendicularis "vertical, as a plumb line," from perpendiculum "plumb line," from perpendere "balance carefully," from per- "thoroughly" (see per) + pendere "to weigh, to hang" (see pendant). As a noun from 1570s. Related: Perpendicularly; perpendicularity.
实用例句
1. The left wing dipped until it was perpendicular to the ground.
左翼下垂至与地面成90度角。
来自柯林斯例句
2. Are the lines perpendicular to each other?
这些直线相互垂直吗？
来自《权威词典》
3. The two lines of bones are set perpendicular to one another.
这两排骨头相互垂直.
来自《简明英汉词典》
4. The plumbline is always perpendicular to the horizontal plane.
