This period of time is often called duration or interval.
这个时间周期通常被称为持续时间或者时间间隔。
Interval training can help you during the transition period between one exercise program and another.
间歇训练可以帮助你从一种训练程序过渡到另一种。
Interval training can help you during the transition period between one exercise program and another.
间歇训练可以帮助你从一种训练程序过渡到另一种。
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