What if one day, you just had to run onto the train, then the train's intelligent system immediately discerned your identity from your wrist watch, and deducted the fare from your bank account?
如果有一天，當你一跨進車廂，車廂智慧系統立即從你手上的腕錶查知你的身份，並自動將車資從你銀行帳戶內扣除，該有多好？