To answer these questions, you need to engage yourself in the process of primary data collection.

要回答这些问题，你必须要自己全心投入基本资料收集的整个过程。

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Research has been undertaken using secondary and primary data collection methods.

使用二级和初级数据收集方法进行了研究。

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Research has been undertaken using secondary and primary data collection methods.

使用二级和初级数据收集方法进行了研究。

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