| 单词 | directrix |
| 释义 | directrixdirectrix /dɪˈrɛktrɪks, daɪ-/ noun (plural directrixes or directrices /-trɪsiz/) [countable] math, science, geometry a straight line drawn below a parabola (=deep curve with steep sides), which is used to describe the shape of the curve. Each point on the curve is equal to its distance from the directrix divided by its distance from another fixed point inside the curve. |
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