Sampling and interviewing respondents by cell phone is now a necessity if telephone surveys are to provide valid, reliable and representative data.

如果想通过电话调查提供有效、可靠和有代表性的数据，现在有必要开展移动电话抽样和采访工作。

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They have authorised faster trains and new hospitals, mandated ever tougher sentencing laws and governed DNA sampling and stem-cell research.

它们已批准建造更快的火车或新的医院，授权更加严厉的判例法以及管理DNA样本和造血干细胞研究。

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Ray-casting algorithm is that ray passes volume cell of data field, sampling relative pels color to form video image.

光线投影算法将光线穿过数据场中的体元，采样得到相关象素的颜色， 形成可视图。

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