a changeable sit uation; constant change of events; troubled clouds gather thickly
❍ 辽阔的天上，涌起一疙瘩一疙瘩的浓云，～，心里在憧憬着一个伟大的理想，……(梁斌《红旗谱》467) On the broad expanse of heaven dense clouds were gathering and shifting shape in the wind.Thinking of their great cause，…/然而那么～的事，恐怕世界上是不多有的，……(鲁迅《三闲集·通讯“回信”》77) But seldom can the world have known so many changes，…/光凭我们这点水平，是弄不明白当前的～的，得靠它。(金敬迈《欧阳海之歌》203) My political vision isn’t sharp enough for me to see through all the stormy clouds confronting us today. I’ve got to rely on this.
风云变幻
vicissitude of situation; changeable(or fast-changing) situation;constant change of events
不管世界风云如何变幻，经过长期历史考验的两国友谊必将继续发展。Come what may,friendship between the two countries that has stood the long test of history will continue to grow./国际形势～。The international situation is highly volatile.
风云变幻fēnɡ yún biàn huàn
比喻局势复杂多变。a changeable situation, constant changes of events, rapid change