STEM与日常科技·英语30篇（9）
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How Contactless Payment Cards Work Inside Your Wallet
非接触式支付卡如何在钱包内正常工作
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Even inside a leather wallet, your contactless card sends signals to payment terminals.即使放在皮质钱包里，你的非接触式卡片也会向支付终端发送信号。
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It uses near-field communication technology with a range under four centimeters.它采用近场通信技术，有效距离不到4厘米。
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The terminal powers the card’s chip wirelessly for just one second during tap.终端在刷卡时会无线为卡片芯片供电，仅持续1秒。
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Metal cards or foil-lined wallets sometimes block the signal completely.金属卡或内衬铝箔的钱包有时会完全屏蔽信号。
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Most modern wallets now have RFID-blocking pockets you can slide open.如今大多数现代钱包都配有可滑动开启的RFID屏蔽口袋。
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You’ll feel a soft buzz and see a green checkmark when payment succeeds.支付成功时，你会感到轻微震动，并看到绿色对勾。
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Cards reject duplicate taps within five seconds to prevent double charges.卡片会在5秒内拒绝重复刷卡，防止重复扣款。
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If the terminal doesn’t respond, try removing the card and tapping directly.如果终端无响应，请取出卡片直接刷卡。
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Banks send instant SMS confirmations so you always know what was charged.银行会即时发送短信确认，让你随时了解扣款详情。
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Children’s cards often require a PIN after three contactless transactions.儿童卡通常在连续3次非接触式交易后需输入密码。