civil defence
noun [ U ] uk/ˌsɪv.əl dɪˈfens/ us/ˌsɪv.əl dɪˈfens/
民防（指战时为保护民众生命财产免受敌军侵害而对民众所作的组织训练）
the organizing and training of ordinary people to protect themselves or their property from an enemy attack during a war
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