历史遗留问题

problem(or issue)left over by history (or from the past;a legacy from the past;an issue rooted in history)
“一国两制”的科学构想是解决历史遗留下来的香港问题的最佳方案。The scientific concept of “one country,two systems” is the best solution to resolving the question of Hong Kong,one left over by history./由于～，一些第三世界国家之间存在着矛盾和纷争，甚至发生武装冲突。Owing to problems (or issues)left over from the past,there are contradictions,disputes and even armed conflicts between some third world countries./同邻国解决了很多～ solve many prob lems with neighbors left over by history/妥善处理～properly handle issues left over from history/通过协商妥善地解决～ proper negotiated settlement of the question of…，which is left over from the past