• 1. on guard: 警惕 | 站岗 | 警觉的 | 警戒
• 2. be on guard: 警惕 | 防备 | 防范 | 戒备
• 3. on guard against: 提防 | 警惕

更多释义

• 1.Men on guard duty sometimes think they see something moving to one side of them．
  值班的人有时会以为看到了什么东西向他们这边移动。
  dict.yoduao.com
• 2.Teachers must stay on guard when it comes to what their students are doing in classrooms and how technology could be playing a negative role in the learning process.
  当涉及到学生在课堂上的行为以及技术如何在学习过程中发挥负面作用时，教师必须保持警惕。
  dict.yoduao.com
• 3.Police were on guard at Barnet town hall.
  警察在巴尼特市政厅值守。
  dict.yoduao.com

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