不变

原形：invariable复数：invariables

The speed of light in a vacuum is an invariable constant.
真空中光的速度是一个不变的常数。
The laws of physics are considered invariable and universal.
物理定律被认为是不变的和普遍适用的。
His daily routine remained invariable for years.
他多年的日常生活始终保持不变。
The principles of democracy are invariable, though their application may vary.
民主的原则是不变的，尽管其实施方式可能有所不同。
In mathematics, pi (π) is an invariable irrational number.
在数学中，圆周率(π)是一个不变的无理数。
The Earth's rotation around the sun follows an invariable path.
地球围绕太阳的公转遵循一个不变的轨道。
The price of gold tends to fluctuate, not remain invariable.
黄金的价格往往会波动，而不是保持不变。
Basic human rights should be invariable across all cultures.
基本人权在所有文化中都应是不变的。
The company's policy on health and safety is invariable.
公司的健康与安全政策是不变的。
The rules of grammar are generally invariable, but language evolves over time.
语法规则通常是不变的，但语言会随着时间的推移而演变。