英[saɪn]美[saɪn] n. [数]正弦 记忆方法 词源记忆法 来自拉丁语sinus，弯，曲，词源同sinus，sinuous.后用于几何学名词指正弦。 中文 双解 英英 词法 noun(名词) 正弦 noun(名词) (in a triangle that has one angle of 90°) the ratio of the length of the side opposite an angle less than 90° divided by the length of the hypotenuse (= the side opposite the 90° angle)正弦 n.ratio of the opposite side to the hypotenuse of a right-angled triangle同义词：sin 词态 语态 双解例句 noun(名词) 正弦 实用短语sine mora不再犹豫arc sine反正弦,逆正弦sine protractor正弦量角器,正弦尺,正弦规sine series正弦级数sine scleroderma硬化的硬皮病sine weighting正弦加权sine method正弦法sine generator正弦波发电机 常用短语sine wave正弦波sine function正弦函数sine qua non（拉）必要条件；要素sine curve正弦曲线sine bar正弦规；正弦板sine die无限期地