如果存在一个力矩，就会产生一个，角加速度。

And if there is a torque, there's going to be an angular acceleration.

若存在净转矩，就会产生角加速度，正如你们所见。

If there is a net torque, there will be an angular acceleration, and that's what you see.

在旋转时，力变成力矩，质量变成转动惯量，加速度变成角加速度。

In rotation, force becomes torque, mass becomes moment of inertia, and acceleration becomes angular acceleration.