prison preventive
监狱的预防
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The policemen take preventive measures against the escaping of the prisoners from the prison.
警察采取防范措施，防止犯人越狱。
youdao
If the court finds Breivik insane, he cannot be sentenced to prison or preventive detention, but can be confined to a psychiatric institution for the rest of his life, pending reviews of his mental state by the court every three years.
CNN: What will happen to Norway's mass killer Breivik?
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