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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The cell type also has an attribute that represents whether the cell is valid based on the row, column, and grid requirements, as shown in Figure 7.

单元格类型还有一个属性，它根据行、列和子网格限制表示这个单元格是否有效，见 图 7。

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When you set the valid flag on the cell through these calls, XMLBeans eventing fires another event.

通过这些调用设置单元格的有效标志之后，XMLBeans事件机制触发另一个事件。

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It is easy for a brand to step away from such a big spend by citing the distraction of the second screen, which is a valid concern should the brand not commit itself to recognize that the person watching the Super Bowl has a device (cell phone, tablet, etc.) in his or her hand.

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