Alternatives like cash, credit CARDS and keychain payment CARDS with radio-frequency identification chips can be stolen and used by others.

而其它例如，现金、信用卡以及采用无线电频率识别的钥匙链付费卡的方法都可能被盗或被他人使用。

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Contactless payments take place with credit cards or smart phones that have chips implanted with radio frequency identification, commonly referred to as RFID.

FORBES: Contactless Payments--Bad News for Consumers?

The most interesting experiment is being done by Qantas at Sydney and Perth airports with high-tech frequent-flier cards that are embedded with an RFID (radio-frequency identification) chip.

BBC: In brief: Ash cloud threatens UK flights