double-decker  
noun [ C ] uk/ˌdʌb.əlˈdek.ər/ us/ˌdʌb.əlˈdek.ɚ/
  (BUS)     
  双层公共汽车
a bus with two levels
   (SANDWICH)     
 双层三明治
a sandwich made with three pieces of bread with food such as cold meat or cheese between them
 
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