be on active service

• 1. 服役: serve | service | Commissioned
• 2. 预备役服役奖章: Armed Forces Reserve Medal
• 3. 国防部服役奖章: National Defense Service Medal

更多释义

• 1.录音设备安在了正在服役的飞机上。
  Voice recorders were retrofitted into planes already in service.
  dict.yoduao.com
• 2.今天正在征调一些部队去海湾服役。
  Units are being called up today for service in the Gulf.
  dict.yoduao.com
• 3.战争期间，他大部分时间都在部队服役。
  He served in the ranks for most of the war.
  dict.yoduao.com

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