a straight line that intersects a curve at two or more points
ratio of the hypotenuse to the adjacent side of a right-angled triangle
secant的用法和樣例：
例句
用作名詞 (n.)
A new damping estimation method, the secant line method, was presented, that is based on the distance of neighbor peaks and valley of oscillation. 摘要提出利用相鄰波峰和波谷之間距離估計阻尼比的割線方法。
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