adj.警觉的，警惕的，警戒的，谨慎

The vigilant security guard monitored the entrance at all times.
警惕的保安人员时刻监视着入口。
She was a vigilant mother, always keeping an eye on her children.
她是一位警惕的母亲，总是密切注意她的孩子们。
The detective was vigilant in searching for clues at the crime scene.
侦探在犯罪现场非常警惕地寻找线索。
A vigilant citizen is the backbone of a safe community.
警惕的市民是安全社区的基石。
The hiker maintained a vigilant watch for potential dangers on the trail.
徒步旅行者对小径上的潜在危险保持高度警惕。
The city's traffic police were vigilant during the holiday rush.
城市交警在节日期间的交通高峰时段格外警惕。
The fire department issued a vigilant reminder to residents about fire safety.
消防部门向居民发出了关于消防安全的警戒提示。
The IT team was vigilant against cyber threats to protect the company's data.
IT团队对网络安全威胁保持警惕，以保护公司的数据。
In times of war, soldiers must be vigilant against ambushes.
在战争时期，士兵必须警惕伏击。
The vigilant farmer noticed the rustling in the bushes and approached cautiously.
警惕的农夫注意到灌木丛中的动静，小心翼翼地走过去。