经检测这样的人中，中间人攻击，适当采取警戒行动。

Upon detecting such a man-in-the-middle attack, appropriate alerting actions are taken.

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一名发言人说，此次撤出行动是临时性的，旅馆的安全警戒更为严格。

A spokesman said the move was temporary while security at guesthouses was tightened.

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例如，军事网络中流量状况的异常变化预示着随即要发生一系列行动、一连串的命令或者网络变得警戒。

For example, an unexpected change of the traffic pattern in a military network may indicate a forthcoming action, a chain of commands, or a state change of network alertness.

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