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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，这一点在Line官方版本下载中也有详细论述
Progress was slow and new releases came courtesy of voices38.
型月曾在1999年冬季 Comic Market 上发行过了《月姬》的试玩软盘。由于当时的型月还是名不见经传的小工作室，因此仅有50份，并且没有再次发行过。虽然当年售价仅为100日元，但考虑到其少得可怜的数量，且是在27年前正式版发布前售出的，这份珍贵藏品可谓是无价之宝。
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