1.  spare
2.  ready
3.  in reserve

• 1. 备用的: auxiliary | spare | in reserve
• 2. 数码设备用的: windows image acquisition
• 3. 备用的事物: standby

更多释义

• 1.我把钥匙丢了，还没有备用的。
  I've lost my key and I haven't got a spare.
  dict.yoduao.com
• 2.如果你将要参加一场重要的考试的话，你最好准备多一支备用的笔。
  If you are to have an important exam, you'd better prepare one more pen in reserve.
  dict.yoduao.com
• 3.目前在我们这里登记备用的护士很少。
  We have very few nurses on our books at the moment.
  dict.yoduao.com

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