二手烟对于小孩来说存在着更多的风险，他们最易受到二手烟的威胁。
Secondhand smoke poses additional risks for children, who are especially vulnerable to the effects of secondhand smoke. Problems include.
儿童吸二手烟易导致心理亚健康。
烟羽的扩散易受地形的影响。
The smoke-plume spreading are affected by the topography there.
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