Robin constant

例句：

1. 1. The constants of a material are its properties that remain unchanged under constant temperature and pressure.
   材料的常数是其在不同温度和压力下保持不变的性质。
2. 2. The constants of the universe are still being studied by scientists around the world.
   宇宙的常数仍然由世界各地的科学家进行研究。
3. 3. The constants of the Earth's magnetic field have been measured with great accuracy.
   地球磁场的常数已经被测量得非常准确。