- direct
- rectilinear
- rectus
- sagittal
- straight
- unswerving
- upright
- 直: straight; stiff
- 的: 4次方是 The fourth power of 2 i ...
- 垂直的;正直的: upright
- 笔直的: direct; ramrod; straightforward; strict
- 垂直的: erect; kathet; normal; orthogonal; perpendicularis; vert vertical; vertical/ plumb/ upright/ perpendicular; verticalis; vertically transcurrent; wall-sided
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