vigilantly

例句：

1. 1.He was vigilantly watching the security cameras.
   他警惕地看着监控摄像头。
2. 2.She was vigilantly waiting for her friend to arrive.
   她警惕地等待着朋友的到来。
3. 3.The thief was vigilantly avoiding detection.
   这个小偷警惕地避开了侦查。