几经周折才告成功: only after many setbacks was success achieved
稿子几经删改才定下来: the draft was revised several times before it was finalized
沧桑: (见“沧海桑田”) 短语和例子饱经沧桑 have experienced many vicissitudes of life
人世沧桑: human events are as uncertain as the weather.; instability of human affairs; mutability of human affairs; the vicissitudes of human affairs; tremendous changes in the world