• vt. 警告；使警觉，使意识到
• adj. 警惕的，警觉的；留心的
• n. 警戒，警惕；警报
• n. (Alert)人名；(西)阿莱尔特

来自意大利语all’erta. -erta, 同 erect，竖直。即全部到城墙上守城。

alert

alert: [17] Alert comes, via French, from an Italian phrase all’ erta ‘on the look-out’, or literally ‘at the (alla) watch-tower (erta)’. Erta was short for torre erta, literally ‘high tower’, in which the adjective erta ‘high’ came ultimately from Latin ērectus, the past participle of ērigere ‘raise’.
=> erect

alert (adv.)

"on the watch," 1590s, from French alerte "vigilant" (17c.), from phrase à l'erte "on the watch," from Italian all'erta "to the height," from erta "lookout, high tower," noun use of fem. of erto, past participle of ergere "raise up," from Latin erigere "raise" (see erect). The adjective is attested from 1610s, the noun from 1803, and the verb from 1868. Related: Alerted; alerting.

1. The armed forces were on high alert to guard against any retaliation.

武装部队保持高度戒备，以防发生任何报复行动。

来自柯林斯例句

2. They want to be on the alert for similar buying opportunities.

他们希望随时掌握有关类似购买机会的信息。

来自柯林斯例句

3. The bank is alert to the danger.

银行充分意识到了危险。

来自柯林斯例句

4. All the Plymouth hospitals are on red alert.

普利茅斯所有的医院都处于紧急状态之中。

来自柯林斯例句

5. Soldiers and police have been put on alert.

士兵和警方都已进入警戒状态。

来自柯林斯例句