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.
权威例句
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。
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。
3. The bank is alert to the danger.
银行充分意识到了危险。
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。
5. Soldiers and police have been put on alert.
士兵和警方都已进入警戒状态。
词语辨析
【cautious, considerate, alert】
这组词都有“小心的,谨慎的”的意思,其区别是:
cautious: a.细心的,谨慎的。
• He has a cautious attitude about spending money. 在花钱的问题上他态度谨慎。
considerate: a.关心他人的,体贴的。
• He is always considerate of others; he is kind and sympathetic. 他总是很体谅他人,并且慈祥而富有同情心。
alert: a.警惕的,留神的。
• The hostess remained standing, alert to every guests' drinking need. 女主人一直站在旁边,时刻准备给大家斟酒。