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There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.。关于这个话题，51吃瓜提供了深入分析
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Access to affordable childcare remains a major constraint, and high income taxes and complex benefits can discourage people, especially second earners, from working more hours.，详情可参考heLLoword翻译官方下载