alarm

n.惊恐；警报 vt.使…惊恐；向…报警

airsick, airsickness, airspace, airtight, airway, airwoman, airworthiness, airworthy, airy, airy-fairy, aisle, aitch, aitchbone, ajar, aka, akimbo, akin, Alabama, alabaster, alacrity, alarm clock (also alarm), alarmed, alarming, alarmist, alas, Alaska, albatross, albeit, Albert Einstein, albino, album, albumen, albumin, alchemist, alchemy, alcohol, alcoholic, alcoholism, alcove, alder,