概述
constant是一个英语单词，意为“不变的，恒定的”。它可以用作形容词或名词，常用于描述某种状态或属性的稳定性和持续性。
用法
1. 形容词：用于描述某种状态或属性的稳定性和持续性，常与be动词连用。例如：
– The temperature in this room is constant at 25 degrees Celsius.
– She is a constant source of inspiration for me.
2. 名词：表示一个不变的量或值。例如：
– In physics, the speed of light is a constant.
– The constant in this equation is equal to 3.
举例说明
1. 形容词：
– The sound of the waves crashing against the shore was a constant presence during our vacation.
– He was a constant support to his wife during her illness.
2. 名词：
– In mathematics, the constant pi (π) represents the ratio of the circumference of a circle to its diameter.
– The gravitational constant (G) is a fundamental constant in physics that describes the strength of the gravitational force between two objects.
需要注意
1. 在数学和物理学中，常数通常用大写字母表示。
2. 在程序设计中，常量（constant）是一个固定的值，不能被修改。
3. 在口语中，常用的同义词有“continuous”和“consistent”，但它们的用法和含义略有不同。
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