standby
  備用暫存器
  standby
  待用
  stand-by
  待用 待命
  standby
  待用 待命
  Stand-by n. One who, or that which, stands by one in need; something upon which one relies for constant use or in an emergency.
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  standby
       adj : ready for emergency use; "a standby generator"; "a standby
             crew"
       n 1: something that can be relied on when needed
       2: an actor able to replace a regular performer when required
          [syn: understudy]