Gone with the Wind(《乱世佳人》)中tomorrow is another day是怎么理解?

Gone with the Wind(《乱世佳人》)中tomorrow is another day是怎么理解?
忧郁本人英语水平不好,但是期末将至,英语的难题就靠大家来解答了.Gone with the Wind也就是《乱世佳人》中tomorrow is another day是怎么理解?老师要求50个英文单词来解释,帮帮小弟咯