1.  guard
2.  take precautions
3.  be on the alert
4.  keep a sharp lookout
5.  exercise vigilance

• 1. 戒备: watch out for | guard against
• 2. 全城戒备: City Under Siege | City Siege
• 3. 戒备状态: DEFCON | defense readiness condition | state of readiness

更多释义

• 1.你进不去，整个地区都戒备森严。
  You can't get in; the whole place is guarded.
  dict.yoduao.com
• 2.她整个人保持着戒备状态。
  Her whole bearing was alert.
  dict.yoduao.com
• 3.对该配方戒备森严。
  The formula is jealously guarded.
  dict.yoduao.com

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