The other half of the brain stays awake at a low level of alertness. 另一半大腦在低水平警戒狀態(tài)下保持清醒。
In response to that announcement Tuesday, South Korea said it has strengthened its security level and alert status. 做為北韓宣布的回應，南韓星期二說(shuō)提升自己的安全級別和警戒狀態(tài)。
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