Methods Epidemiological field research method was adopted to study it.

方法通过现场流行病学方法进行调查。

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METHODS We adopted Epidemiological Field Research method to study it.

方法采用流行病学现场研究方法进行研究。

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METHODS We adopted Epidemiological Field Research method to study it.

方法采用流行病学现场研究方法进行研究。

youdao