is with respect to a point,

是对于一个点而言的
and there's nothing called

但从来没有说
the mass with the respect to the point.

质量是关于哪个点的质量
The mass is just the mass.

质量就是质量
The moment of inertia depends on the point

而转动惯量取决于你在计算时
around which you're computing the moment of inertia.

物体所绕的那个点
It's a variable.

是可变的
It's also worth knowing that

还有件需要知道的
if the body's being rotated about mass m3,

如果这个物体绕 m3 旋转
then m3 doesn't contribute to the moment of inertia. It's out.

那 m3 就对转动惯量无贡献可以不管它
Anything sitting on the axis doesn't contribute.

转轴上的质量都对转动惯量无贡献
Things which are further away

离轴越远的物体