In spite of improving success rates nationally, successful infertility treatment often requires more than once cycle.

尽管全国成功率得以提高，成功的不育治疗通常要求不止一个周期。

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Perlow calls this vicious cycle the "cycle of responsiveness": Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.

佩洛将这种恶性循环称为“响应周期”：一旦老板和同事感受到员工的响应性增强，就会要求该员工工作更长时间。

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If sufficient rain falls the next year to form another lake, the eggs hatch, and once again the shrimps pass rapidly through their cycle of growth, adulthood, egg-laying, and death.

如果第二年有足够的雨水形成另一个湖泊，卵就会孵化，小虾会再次快速地经历生长、成年、产卵和死亡的循环。

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The central bank keeps its independence from government and does not have to worry about selling bonds back into the market once the interest-rate cycle turns.

ECONOMIST: Appraising the European Central Bank

And this needs to be done not just once during the annual planning cycle, but at regular intervals so that new projects, initiatives, and issues are incorporated into the overall strategic fabric.

FORBES: Show Your People the Forest so They Don't Get Lost in the Trees

The drought cycle has shrunk from once every eight years to once every three years, according to the American government's Famine Early Warning System.

ECONOMIST: The Horn of Africa