One-half of each solenoid loop was replaced with an aluminum card into which tiny vicalloy bar magnets were embedded.

每个螺线管回路的一半都换成了铝卡，其中嵌入了细小的维卡合金棒形磁铁。

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"We don't tend to take into account future costs," says Oren Bar-Gill, a law professor at New York University who has studied credit-card contracts and customer behavior.

“我们不倾向于考虑到未来成本，”纽约大学研究信用卡合同和客户的行为的法学教授奥伦·巴·吉尔说。

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Then she and her husband waltz in, buy some happy hour beer with the card, and eat the bar snacks for dinner.

然后她和丈夫悠然地走进餐馆，用代金卡买一些减价供应的啤酒，吃些小吃点心当正餐。

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To use a card at checkout, a cashier can either scan the card's bar code from the smartphone or type in the member's ID number.

WSJ: Store Loyalty Cards on Your Smartphone

Those without printers can grab a free PayNearMe card at one of 7-Eleven's 6, 000 locations and use the card's bar code in lieu of a printed sheet.

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He also sees a trend toward e-gift cards or virtual gift cards, which boil the card down to a bar code--no plastic necessary.

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