Vigilant（形容词）警觉Keeping careful watch for possible danger or difficulties. 2. Hazard（名词）危害；隐患A potential source of harm or danger. 3. Evacuate（动词）疏散；撤离To leave a place quickly, especially because of danger. 4. Precaution（名词）预防措施；防备An action taken to prevent something dangerous or unpleasant from happening. 5. Defuse（动词）消除（危险、紧张局面等）To make a dangerous or tense situation less serious or harmful.
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