1.  be always on the alert
2.  be ever prepared

• 1. 常备: Standing
• 2. 常备军: Standby Force | standing army | miles perpetuus
• 3. 常备借贷便利: SLF | Standing Lending Facility

更多释义

• 1.以色列拥有一支规模相对较小的常备军，它的兵力基于其预备役部队。
  Israel has a relatively small standing army and its strength is based on its reserves.
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• 2.突击巡察有助于使员工常备不懈。
  Surprise visits help to keep the staff on their toes.
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• 3.直到1697年的法国战争，威廉三世才说服国会建立一支专业的常备军，而国会这样做的代价是将军队置于严格的立法控制之下。
  Not until the war France in 1697 did William III persuade Parliament to create a professional standing army, and Parliaments price for doing so was to keep the army under tight legislative control.
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