adj. 1.警惕的，警觉的。 2.机警的，机灵的。 n. 1.警戒；警报。 2. 警戒期间。 3.【军事】紧急待命。 短语和例子 No. one alert 一级战备。 On the alert 警惕，提防。 vt. 使警戒。 The troops were alerted. 部队在待命中。 adv. -ly ,-ness n.
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" 同义词：watchful,
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" 同义词：alive, awake,
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" 同义词：brisk, lively, merry, rattling, snappy, spanking, zippy,
warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries" 同义词：alarm,
an automatic signal (usually a sound) warning of danger 同义词：alarm, warning signal, alarum,
a warning serves to make you more alert to danger 同义词：alerting,
condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis" 同义词：qui vive,
To be alert is to be in a state of alertness.
例句与用法
1.
She was very brisk and alert . 她完全是一副干脆利落、精神抖擞的神情。
2.
Her work is extraordinary rich and alert . 她的作品特别华丽而灵活。
3.
A lot of people will be alert and waiting . 许多人都将提高警惕等待着。
4.
The authorities were alerted to the danger . 当局对危险警惕起来。
5.
Feminine craft was alert to prompt it . 女性的机灵会警觉地提醒。
6.
A hotel alert rated everything in the book . 饭店报警按规定是重于一切的。
7.
She suddenly brightened into alert attention . 她突然目闪睛光，全神贯注。
8.
We will alert operating personnel to repair . 我们将要通报操作人员去维修。
9.
Hearing this , i was instantly on the alert . 我一听这话，当下就警惕起来。
10.
The cat is alert to every sound and movement ... 那只猫对任何响动都很警觉。
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