constant

The constant noise from the construction site next door made it hard for her to sleep.

(Chinese) 隔壁工地持续不断的噪音让她很难入睡。

The temperature inside the laboratory must be kept at a constant twenty degrees Celsius.

(Chinese) 实验室内的温度必须保持在恒定的20摄氏度。

In the equation for the area of a circle, pi is a mathematical constant.

(Chinese) 在圆面积的方程中，派（π）是一个数学常数。

The speed of light in a vacuum is a fundamental physical constant.

(Chinese) 真空中光速是一个基本的物理常数。