Another fast ride a few minutes, then slow, then fast, alternating cycle of this predicament, to be effective in cardiac workout.

再快骑几分钟，然后再慢，再快，如斯交替轮回，可有效地锻炼心脏功能。

youdao

Primary electrical power is provided by two engine driven generators which supply three-phase, 115 volt 400 cycle alternating current.

主电力是由两个发动机驱动发电机供应三相，115伏400周期交流电。

youdao

The SCR controls half of the positive cycle of alternating current applied to it.

可控硅控制的一半施加到其的交流电流的正周期。

youdao

Until the coup, Thailand seemed to be escaping its historic cycle of alternating military dictatorships and weak civilian rule.

ECONOMIST: Heading for uncertainty