mǎkè yǐqián zǒng juéde shǒujī zhīfù jiù gòule hòulái yǒuyīcì zìdòng shòuhuòjī zhǐ shōu xiànjīn tā cái fāxiàn língqián yě yǒuyòng

马克以前总觉得手机支付就够了，后来有一次自动售货机只收现金，他才发现零钱也有用。

Mark used to think mobile payment was enough, but after a vending machine only accepted cash one time, he realized that spare change is also useful.