English ⇄ Chinese Japanese Russian

virtuous cycle stresses
econ.	"круг благоприятных возможностей" (пример: Productivity convergence, export expansion, and labor absorption create a virtuous cycle that propel the economy forward... A.Rezvov)
inf.	"порочный" круг с положительными последствиями (karakula); замкнутый круг благоприятных событий (a chain of events in which one desirable occurrence leads to another which further promotes the first occurrence and so on resulting in a continuous process of improvement: But the economy is depressed, in large part, because of the housing bust, which immediately suggests the possibility of a virtuous circle: an improving economy leads to a surge in home purchases, which leads to more construction, which strengthens the economy further, and so on. 4uzhoj); "добродетельный круг" (как противоположность порочному кругу – vicious circle 4uzhoj)
med.	добродетельный цикл (сбалансированный цикл образования и разрушения костной ткани biomolecula.ru dimock)
O&G, casp.	эффективный цикл (Yeldar Azanbayev)