Wallets containing the charity CARDS and the control sample were least likely to be returned, with rates of 20 and 15 per cent respectively.

放有慈善卡的钱包以及对比组的钱包归还率最低，分别为20%和15%。

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The scheme was evaluated using a matched control sample of cases from adjacent areas.

这项计划是通过与附近地区相匹配的对照样本案例进行对比来评估的。

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Conclusion: the relative bioavailability of ribavirin granules is better than that of the control sample.

结论：利巴韦林颗粒剂相对生物利用度较好。

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One is in the U.S.at the Centers for Disease Control, where there is a sample of variola, which is kept, you know, frozen on ice in a heavily guarded facility.

一个在美国的疾病控制中心,那有一支天花病毒的样本,冰冻后置于重重保护之下

耶鲁公开课 - 生物医学工程探索课程节选

As a control sample, the scientists gave the same puzzles to forty-eight students working by themselves.

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At the same time it was activated in space, a control sample was activated here on Earth.

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After comparing the performance of a maquiladora-using firm with that of a control sample, the authors found no evidence of net gain in the use of a maquiladora.

ECONOMIST: A look at noteworthy articles from business journals