tim·er /ˈtaɪmɚ/
  計時器,定時器
  timer
  失效計時器
  timer
  計時器
  Tim·er n.
  1. A timekeeper; especially, a watch by which small intervals of time can be measured; a kind of stop watch. It is used for timing the speed of horses, machinery, etc.
  2. Internal-combustion Engines In electric ignition, an adjustable device for automatically timing the spark.
  ◄ ►
  timer
       n 1: a timepiece that measures a time interval and signals its
            end
       2: (sports) an official who keeps track of the time elapsed
          [syn: timekeeper]
       3: a regulator that activates or deactivates a mechanism at set
          times