带一张备用的银行卡和一些额外的现金。

Carry a back-up piece of plastic and some extra cash.

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例如，投影仪上的电灯泡坏了（而你又没有带备用的），或者你的公文包落在机场了。

What if your projector blew a light bulb (and you forgot to bring a spare) or your briefcase was lost at the airport?

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轻装上路(财务)带一张备用银行卡。

Travel light (financially) and carry a spare card.

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