这个矩阵的零空间包含所有被变换为零向量的向量。

The ___null-space of this matrix contains all vectors that are transformed into the zero vector.

在这个机械结构中，null-space代表了所有不会引起末端执行器移动的关节角度组合。

In this mechanical system, the ___null-space represents all joint angle combinations that cause no movement in the end effector.