研究者们没有找到任何关于食品类型和包装上BPA水平的样本。他们没能接触到食品公司询问关于包装原则的问题。

The researchers couldn't find any patterns in BPA levels by food type or brand. They did not contact companies to ask about their packaging methods.

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研究者们没有找到任何关于食品类型和包装上BPA水平的样本。

The researchers couldn't find any patterns in BPA levels by food type or brand.

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此外，本文还应用市场学的分析方法研究了乡村旅游的市场需求、产品类型和开发模式。

In addition, market demands, product types and developing models of rural tourism are also studied with the application of market theories.

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