良性循環

virtuous cycle (i.e. positive feedback loop)

good / very / very much

positive (in its effect) / leading to good consequences / virtuous / (medicine) benign (tumor etc)

nature / character / property / quality / attribute / sexuality / sex / gender / suffix forming adjective from verb / suffix forming noun from adjective, corresponding to -ness or -ity / essence / CL:個|个[ge4]

to follow / to adhere to / to abide by

to cycle / to circulate / circle / loop

surname Huan

ring / hoop / loop / (chain) link / classifier for scores in archery etc / to surround / to encircle / to hem in