Oyster card
noun [ C ] uk/ˈɔɪ.stə ˌkɑːd/ us/ˈɔɪ.stɚ ˌkɑːrd/
(在伦敦公共交通系统内用来支付车费的)八达通卡
a small plastic card that can be used as a method of payment on buses, trains, and the underground in London
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