善行数变 meaning in Chinese

migrant and variable
mobile and changeable

Wind stroke is an emergency case manifested by falling down in a fit with loss of consciousness , or hemiplegia , slurred speed and deviated mouth . it is characterized by abrupt onset with pathological changes varying quickly like the wind , from which the term “ wind stroke ” comes
例18中风是以突然昏仆,不省人事,或半身不遂、语言不利、口角歪斜为主的一种疾病.因其起病急骤、变化多端,与风性善行数变的特征相似,故类比称为“中风”