In positive psychology, flow, also known as the zone, is the mental state of operation in which a person performing an activity is fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity.

在积极心理学中，心流也被称为“化境”，是指一个人在进行活动时，完全沉浸在一种精力集中、全身心投入和享受活动过程的心理运作状态。