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重点讲解：
1.smolder闷烧
In case of fire, vinyl building products begin to smolder long before they burn, releasing toxic fumes of hydrochloric acid, and thereby threatening building occupants and firefighters.
为了防火，乙烯基建筑产品在燃烧之前很久就开始闷烧，释放有毒盐酸气体，从而威胁住户和消防员。
2.ritzy豪华的
I learned to live a lower-middle-class life now that the cash, fancy school, and ritzy vacations were all gone.
没有了钱，没有了贵族学校，没有了豪华的假期，我开始学着过中低层阶级的生活。
