n.a chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids

同義詞：bomb shelterbombproof

1. During World War II, many cities in Europe had air-raid shelters built underground to protect civilians from bombings.
   在第二次世界大戰(zhàn)期間，歐洲許多城市建有地下防空洞，以保護平民免受轟炸。
2. The government set up an air-raid shelter in every neighborhood to ensure the safety of the residents during airstrikes.
   政府在每個社區(qū)都設立了防空洞，以確保居民在空襲期間的安全。