Word forms: plural, 3rd person singular present tense alerts, present participle alerting, past tense, past participle alerted
1ADJ-GRADED 警觉的;警惕的;留神的;机敏的 If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen. 警觉的;警惕的;留神的;机敏的