translation sine function

例句：

1. 1. The sine function is used to describe the shape of a wave.
   正弦函数用于描述波的形状。
2. 2. In mathematics, the sine function is a fundamental concept.
   在数学中，正弦函数是一个基本概念。
3. 3. The sine function has many applications in engineering and science.
   正弦函数在工程和科学中有广泛的应用。