Alert

(noun.) a warning serves to make you more alert to danger.

(noun.) condition of heightened watchfulness or preparation for action; 'bombers were put on alert during the crisis'.

(adj.) engaged in or accustomed to close observation; 'caught by a couple of alert cops'; 'alert enough to spot the opportunity when it came'; 'constantly alert and vigilant, like a sentinel on duty' .

(adj.) mentally perceptive and responsive;'an alert mind'; 'alert to the problems'; 'alive to what is going on'; 'awake to the dangers of her situation'; 'was now awake to the reality of his predicament' .

(adj.) quick and energetic; 'a brisk walk in the park'; 'a lively gait'; 'a merry chase'; 'traveling at a rattling rate'; 'a snappy pace'; 'a spanking breeze' .

手打:索菲

• The outer door was quickly opened, and Tom, who was watching outside, was on the alert, in a moment. 哈丽叶特·比切·斯托. 汤姆叔叔的小屋.
• The dog too was on the alert in an instant, and ran whining to the door. 查尔斯·狄更斯. 雾都孤儿.
• Holmes was silent and motionless; but I could tell that he was keenly alert, and that his eyes were fixed intently upon the stream of passers-by. 阿瑟·柯南·道尔. 福尔摩斯归来记.
• Gerald, who was very subtly alert, wary in all his senses, leaned forward and asked smilingly: 'What were you saying? 戴维·赫伯特·劳伦斯. 恋爱中的女人.
• It parts with its flexible responsiveness and alert eagerness for additional meaning. 约翰·杜威. 民主与教育.
• The men there made her alert, roused her curiosity. 戴维·赫伯特·劳伦斯. 恋爱中的女人.
• Methinks I am animated and alert, instead of being depressed and apprehensive? 夏洛蒂·勃朗特. 维莱特.

整理:洛厄尔