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coaster

noun
🔊/ˈkəʊstə(r)/
🔊/ˈkəʊstər/
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  1. a small flat object that you put under a glass to protect the top of a table 玻璃杯垫
  2. a ship that sails from port to port along a coast航行于沿海港口间的轮船Topics Transport by waterc2
    3. see also roller coaster