vigilant [ˈvɪdʒələnt]

例句:

• He warned the public to be vigilant and report anything suspicious.
  他警告公众要提高警惕，遇到任何可疑情况都要报告。
  
• A pilot must remain vigilant at all times.
  飞行员必须随时保持警惕。
  
• He has to learn how to remain vigilant through these long nights.
  他得学会如何在这漫长的黑夜里保持警觉.
  
• We are just trying to be vigilant, pay attention.
  来自VOA
• Rogombe urged voters to remain calm and vigilant.
  来自VOA
• Knox remained "very strong and vigilant".
  来自THETIMES