That a major security breach.

这是严重违反安全的行为.

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If there is a security breach in a small area, it can permeate the entire system.

如果在小范围内有一安全漏洞, 它将扩散到整个系统.

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The security breach was of unclassified systems , not the more secure classified systems.

安全缺口出现在非保密 、 而非安全级别更高的保密系统上.

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