translation.en: When you do this, you'll quickly realize that you spent all of your time on the interface between man and machine, specifically on designing away the friction in the interaction.
translation.zh: 当您执行此操作时，您很快就会发现你花了 你所有的时间上在人和机器之间的接口上， 特别是关于设计互动中的摩擦。