double-decker

noun
🔊/ˌdʌbl ˈdekə(r)/
🔊/ˌdʌbl ˈdekər/
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  1. a bus with two floors, one on top of the other双层公共汽车
    compare single-deckerTopics Transport by bus and trainc1
  2. (North American English) a sandwich made from three pieces of bread with two layers of food between them双层三明治