alertness

n. 警戒,机敏

albatross, albeit, Albert Einstein, albino, album, albumen, albumin, alchemist, alchemy, alcohol, alcoholic, alcoholism, alcove, alder, alderman, aldermanic, ale, alehouse, alert, alertly, alfalfa, alfresco, algae, algebra, algebraic, algebraically, Algeria, Algerian, ALGOL, algorithm, alias, alibi, alien, alienate, alienated, alienation, alight, align, alignment, alike,