Based on the theory and method introduced before, this paper applied the rotation models to compute the sample rotation rate of sampling survey on vacancy rate of households in Shanghai.

包括分层抽样下样本轮换的估计量公式和最优样本轮换率的确定方法。再接着利用前面介绍的理论知识，结合上海市城镇住房空置率抽样调查数据进行实证分析。

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Although Sue took longer to complete her projects than John and both were equally successful on the assignments they completed, Sue was given the first promotion when there came a vacancy.

尽管苏比约翰花了更长时间完成项目，而且两人完成的任务都很成功，但当有职位空缺时，苏得到了第一次升职。

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The abortion issue is likely to remain in the spotlight as President Obama seeks to fill a vacancy on the Supreme Court left by the retirement this summer of Justice David Souter.

VOA: standard.2009.05.17

Dozens wrote to offer apartment shares, tip him off on the vacancy next door or connect him with their awesome landlord.

WSJ: Couplets for Low Rents

But since then, there has been an additional vacancy on that circuit, leaving the court with four vacancies -- 36 percent vacant.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Many thought Mr Gonzales had been Mr Bush's favourite to fill a vacancy on the court. (The chief justice, William Rehnquist, is ill and may soon retire.) But conservatives worried about his relatively easy-going views on abortion.

ECONOMIST: After Ashcroft | The