Since running and walking speeds differ from species to species, the speed at which the treadmill moved was varied so that it raised the heart rates of the different participants to the same level.
因为不同物种跑步和走路的速度不同，跑步机的速度也有所改变，以至于让不同的参与者达到相同的心率。
2
A new model of rub impact force considering varied rotating speed was derived and the rub impact response of a rotor system with initial bending and asymmetric stiffness was analyzed.