Do this a few times or more, then increase to running 2:30, walking 30 seconds to a minute.
如此锻炼几次或是更久，然后增加到跑2：30，步行时间为30秒。
Do this a couple times or more, then increase running to two minutes, with walking for 1 minute.
如此锻炼多次或是更久，然后增加跑步时间到2分钟，相应的步行时间为1分钟。
As the increase of running time, the resonant frequency of ultrasonic motor will decrease, which then leads to the decrease of speed.
随着超声波电机运行时间的增加，其谐振频率会下降，进而使电机速度降低。
As the increase of running time, the resonant frequency of ultrasonic motor will decrease, which then leads to the decrease of speed.
随着超声波电机运行时间的增加，其谐振频率会下降，进而使电机速度降低。
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