没有什么固定公式；有人在黎明时分状态最佳，有人则在夜深人静时灵感最盛。
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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黎智英欺詐案上訴得直：定罪及刑罰被撤銷，出獄時間提前
一名男嬰成為英國首位透過已故捐贈者移植子宮誕生的孩子。
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08