那样的日子一去不复返 them times them times are no more; them times, them times are no more
神为所欲为 nothing is difficult to the man who will try
为所欲为 do as one pleases; act on one's own will; act wilfully; be free to do what one likes; be master of one's time; be one's own man; do everything freely; do just as one pleases; do whatever one likes [pleases]; do whatever one wants to do; have one's own way; have [take] one's (full) swing; stop at nothing 他们为所欲为的时代已经一去不复返了。 the time when they could do just as they pleased has gone forever
多年过去,那些夏日一去不复返 many years have passed since those summer days
那海员的妻子预感到他将一去不复返 the sailor's wife had a foreboding that he would not return. premonition