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 "emergency broadcasting system" 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。
Elv maintenance groups: responsible for the elv work, including fire alarm system, broadcasting system, emergency lighting system, monitoring systems, access control, conference room av system, etc.
弱电维修组：负责全厂弱电工作，包括火灾报警系统，广播系统，应急照明系统，监控系统，门禁系统，会议室影音系统等。
Elv maintenance groups: responsible for the elv work, including fire alarm system, broadcasting system, emergency lighting system, monitoring systems, access control, conference room av system, etc.
弱电维修组：负责全厂弱电工作，包括火灾报警系统，广播系统，应急照明系统，监控系统，门禁系统，会议室影音系统等。
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