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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.
英國商會（BCC）貿易政策主管威廉·貝恩（William Bain）表示，關於接下來可能發生什麼，仍有許多問題未得到解答。
valToGreater2.set(cur, stack2.length ? stack2.at(-1) : -1);