正交(perpendicular to)和垂直(vertical to)的定义有区别吗,区别在哪里?

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涵义方面,vertical表示竖直,大都以地面为参考,也就是垂直于地面的“竖直”,而perpendicular表示与某物呈直角关系,但并不一定是竖直,举例来说,一个旗杆插在地上,可以用vertical,也可以用 the flag pole perpendicular to the horizontal direction,但如果把旗杆水平插在墙上呢?只能用perpendicular to the wall ...


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