invariablenes

例句：

1. 1. The value of a variable is the change in its value over time.
   变量的值是其随时间变化的变化量。
2. 2.Invariants are mathematical objects that do not change with respect to a given transformation.
   不变量为数学对象，它们在给定变换下保持不变。
3. 3. The constant temperature ensures that the material remains stable and does not deform.
   恒定的温度确保材料保持稳定，不会变形。