推 deathcustom : orthogonal is the generalization of the geometri 06/12 10:03
→ deathcustom : notion of perpendicular. 06/12 10:03
1. Vertical 垂直 / 鉛直
This means "up and down" relative to the ground or horizontal. Think gravity
direction.
2. Perpendicular 垂直 / 直交
This means "at a 90° angle to something else". In math/science contexts.
以上是日文用法。
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