bot·tle·neck /ˈbɑtḷˌnɛk/
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 bottleneck
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 bottle-neck
 *瓶頸


 bottleneck
 *瓶頸


 bottleneck
      n : a narrowing that reduces the flow through a channel [syn: constriction,
           chokepoint]
      v 1: slow down or impede by creating an obstruction; "His
           laziness has bottlenecked our efforts to reform the
           system"
      2: become narrow, like a bottleneck; "Right by the bridge, the
         road bottlenecks"