手机付钱Paying with Phones
以前大家出门都要带钱包，现在人们只用一部手机。买东西时打开软件扫一扫，钱马上就付好了。这种变化真的非常大。
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Key Vocabulary
- 二维码QR codeHSK 5
- 现金cashHSK 3
- 密码passwordHSK 4
- 软件softwareHSK 5
- 这种this kind ofHSK
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