这和市面上那些防窥膜的实现方式是几乎相同的，区别在于技术路径。
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.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
Concept art for the project.
The costing estimates do not include time officials spend preparing and appearing as witnesses in person.