| 单词 | upon the alert |
| 释义 | alert /ə-lûrtˈ/adjective
To make alert ORIGIN: Fr alerte, from Ital all'erta on the erect, from erto, from L ērēctus erect alertˈly adverb alertˈness noun alert box noun (computing) A box appearing on the screen of a computer to warn the user of a problem on or upon the alert
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