back·log /-ˌlɔg, ˌlɑg/
 積壓的事務,儲備,積壓起來
 backlog
 未出貨記錄
 backlog
 補缺 待辦
 Back·log n.
 1. A large stick of wood, forming the back of a fire on the hearth.  Contrasted to forestick. [U.S.]
    There was first a backlog, from fifteen to four and twenty inches in diameter and five feet long, imbedded in the ashes.   --S. G. Goodrich.
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 backlog
      n 1: an accumulation of jobs not done or materials not processed
           that are yet to be dealt with (especially unfilled
           customer orders for products or services)
      2: large log at the back of a hearth fire [syn: log]
      3: something kept back or saved for future use or a special
         purpose [syn: reserve, stockpile]
      v : accumulate and create a backlog