“循环的”的英语？

我们必须避免出现20世纪80年代那样具有破坏性的繁荣萧条交替循环的局面。We must avoid the damaging boom-bust cycles which characterised the 1980s.这是完善循环的最低限度人数.That is the minimum number necessary to complete the circuit.人类对硫循环的影响一直是很可观的.Man's effect ...