This paper is an experimental study on the external validity of HSK.

本文是关于HSK外部效度的一次实证性研究。

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This paper provides an experimental study on day lighting of office buildings.

对办公建筑的天然采光进行了实验研究。

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An experimental study on frequency synthesizer of are airborne radar is described.

介绍了一种机载合成孔径雷达频率合成器的实验研究。

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Researchers claimed a breakthrough in preventing the spread of HIV , the virus that causes AIDS, when the results of a study using an experimental vaccine on 16, 000 volunteers in Thailand showed the risk of infection had been cut by 31%.

ECONOMIST: Politics this week