上车请刷卡
我的翻译：please pay by your card when aboard.
正确的翻译：
Please swipe your card(across the reader) when you get on the bus.
把磁卡放入磁卡机划一下，可以说to run/slide one's card through the reader,而把磁卡贴近磁卡机译为to swipe one's card across the reader.brush your card 译为用刷子刷你的卡。