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.
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今年26歲、來自越南的阿宗（化名）曾在台灣工作了7年。他先前工作的工廠缺乏台灣年輕勞工，台籍員工多為六、七十歲的高齡者。「其實工作都靠我們在做，如果我們不做，他們也做不來，但我們一直不受到重視。」他向BBC中文表示。。夫子对此有专业解读