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high-security

adjective
🔊/ˌhaɪ sɪˈkjʊərəti/
🔊/ˌhaɪ sɪˈkjʊrəti/
 [only before noun]
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  1. (of buildings and places建筑或地方) very carefully locked and guarded戒备森严的；警戒严密的
    • a high-security prison警备森严的监狱
    Topics Crime and punishmentc1
  2. (of prisoners囚犯) kept in a prison that is very carefully locked and guarded关押在警备森严的监狱里的