vigilantly
🇺🇸
/ˈvɪdʒɪləntli/
🇬🇧
/ˈvɪdʒɪləntli/
watching carefully for signs of danger or trouble
The security guard was vigilantly scanning the crowd for any suspicious activity.
保安人員正在警惕地掃描人群以尋找任何可疑的活動。