- 問題詳情:Youareatthecheck-outofagrocerystore.Youarereadytopayforyourfood.Thenyoufindoutthatyouhaveleftyourwalletathome! Whatcanyoudo?Don’tworry.Youjusthavetoputyourfingernearaspecialscanner.Thegrocerybillwillbetakenoutofyourbankaccount. Wearenotjoki...
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