[xún huán]
circulate; circle; round; repeat; loop; period; recurrence; cycling; circulating; mixing; circulation; rotation; recursion
move in endless cycles
循环不息
vicious circle
恶性循环
the cycle of the seasons
四季的循环
blood circulation
血液循环
extracorporal circulation
体外循环
four stroke cycle
四程循环{机}