核心词议：
n. 警戒，机敏；戒心
alertness 基本解释
n. 警戒，机敏；戒心
速记方法
知识扩展
alertness 变化形式
易混淆的单词： Alertness
中文词源： alertness
精选例句
常见考点例句：
- It made some evolutionary sense , that state of alertness .
- 那种警觉的状态会形成某种进化感。
- They may also contain ' energy enhancing'ingredients such as caffeine or turbine to boost alertness .
- 他们还可能包含能源成分，如咖啡因或牛磺酸以提高警觉性。
- Research has shown that the lavender scent increases alertness .
- 研究表明薰衣草香味会提高人的警惕性。
- By activating the central nervous system , caffeine boosts arousal and alertness .
- 咖啡因通过激活中央神经系统促进觉醒和警觉。
- Red bull and other energy drinks are high in caffeine as well as the amino acid taurine , which boosts alertness and adrenaline .
- 红牛和其他运动饮料富含咖啡因和能提高警觉及肾上腺素的氨基乙磺酸。
