invariant null space

例句：

1. 1.The temperature invariant is the only constant in nature.
   温度不变是自然界中唯一的常数。
2. 2.The invariant equation describes the motion of a particle in a gravitational field.
   等式描述了粒子在引力场中的运动。
3. 3. The invariant mass of an object is its total mass without regard for its composition or arrangement.
   物体的惯性质量是不考虑其成分或排列的物体总质量。