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alarm n．警报，惊慌，警告器vt. 恐吓，警告
例句：The government is alarmed by the dramatic increase in violent crime.
政府对暴力犯罪案件的急剧增加感到恐慌。
cautious adj. 谨慎的，小心的
例句：Experience of once pain is worth hundreds of thousands of cautions,
一次痛苦的经验抵得上无数次的告诫。
reckless adj. 不计后果的
例句：Anthony is quite reckless of his own safety.
安东尼完全不顾及自己的安全。
caution n．小心，．谨慎，警告vt．警告
例句：Alan told us to proceed with caution in every step.
艾伦要我们每一步都谨慎行事。
precaution n．预防，警幅，防范
例句：The report is focusing on the lack of safety precaution.
该报道集中在缺乏安全预防措施一事上。
