The convicted murderer escaped from a high-security prison.那个被定罪的杀人犯从一所警戒森严的监狱里逃了出去。I was appalled to learn that a serial killer was running a drugs operation in a high-security prison.听说有个连环杀手在一个戒备森严的监狱里经营毒品生意，我感到很震惊。He's in a high-security prison.他被关在一处戒备森严的监狱中。