The discussion here, then, will focus on security at multiple levels.
因此，这里的讨论集中于多个级别的安全性。
Its security system has multiple levels; each level has a relative safety control measures.
其安全体系具有多个层次，每个层次都有相对的安全控制措施。
Its security system has multiple levels; each level has a relative safety control measures.
其安全体系具有多个层次，每个层次都有相对的安全控制措施。
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