However, the researchers said were limitations to the study, including uncertainties about the underlying health data and gaps in the data relating to exposure to second-hand smoke.

然而，研究者也说明了此研究的局限性，其中包括对基础卫生数据的不确定性、与吸入二手烟相关的数据误差。

youdao

The researchers also adjusted their data to consider some factors that could influence a child’s intelligence and skew the results, such as maternal education and second-hand smoke.

研究者们也调整他们的数据考虑一些影响儿童智力的因素并调整结果，例如胎教和二手烟。

youdao

The researchers also adjusted their data to consider some factors that could influence a child's intelligence and skew the results, such as maternal education and second-hand smoke.

研究者们也调整他们的数据考虑一些影响儿童智力的因素并调整结果，例如胎教和二手烟。

youdao

However, the researchers said were limitations to the study, including uncertainties about the underlying health data and gaps in the data relating to exposure to second-hand smoke.

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