Each mother that was used in the study was a smoker. Before each observation session the mother was asked not to smoker for the previous 12 hours.
研究中的所有母亲都是吸烟者，每次观察前要求母亲停止抽烟12个小时。
Each mother that was used in the study was a smoker. Before each observation session the mother was asked not to smoker for the previous 12 hours.
研究中的所有母亲都是吸烟者，每次观察前要求母亲停止抽烟12个小时。
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