n.正弦
prep.〈外〉无

The sine of an angle in a right triangle is the ratio of the length of the opposite side to the hypotenuse.
在直角三角形中，一个角度的正弦是相对边与斜边长度的比例。
She used the sine function to calculate the height of the building.
她使用了正弦函数来计算大楼的高度。
The sine curve oscillates between -1 and 1, representing periodic motion.
正弦曲线在-1和1之间波动，代表周期性运动。
Engineers use sine waves to model sound vibrations and electrical signals.
工程师们使用正弦波来模拟声音振动和电子信号。
In trigonometry, the sine of an angle is equal to the cosine of its complement.
在三角学中，一个角度的正弦等于其余角的余弦。
The sine of 90 degrees is 1, which represents the maximum value of the sine function.
的正弦值为1，这是正弦函数的最大值。
When calculating the area under a sine curve, integration is necessary.
计算正弦曲线下的面积时，需要进行积分。
The sine rule is used to find missing sides or angles in any triangle.
正弦定律用于寻找任何三角形中的缺失边或角度。
The sine function is crucial in solving problems related to circular motion.
正弦函数在解决与圆周运动相关的问题时至关重要。
In physics, sine waves are fundamental for understanding wave phenomena.
在物理学中，正弦波对于理解波现象是基础性的。