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| 1. | French curve | irregular curve | curve board |
| 曲线板 |
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| 2. | French Curve: French curves are difficult to use and not really essential, but they are helpful if you can develop the skills. |
| 曲线板：曲线板比较难使用,且不是必备品。但如果你掌握了使用的必要技巧,它有助于你的工作。 |
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| 3. | A flat drafting instrument with curved edges and several scroll-shaped cutouts, used as a guide in drawing curves when constructing graphs or making engineering drawings. |
| 曲线板一种带有曲线边和几个可剪下的漩涡形图样的扁平制图工具，当制表或绘制工程图时，用作画曲线的定向瞄准装置 |
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