I thought back to the periodic interruption I'd grown up with in the mid-20th century — the ear-invading tone that was part of the radio and TV "emergencybroadcastingsystem" test.
是我回想起我所成长的20世纪中页的耳熟能详的周期性断电,耳边回荡着“备用广播电视应急”测试的声音。
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Elv maintenance groups: responsible for the elv work, including fire alarm system, broadcastingsystem, emergency lighting system, monitoring systems, access control, conference room av system, etc.