1·Of course, just because it's a persistent theme doesn't mean that it's static.
当然，只是因为的永久的主题并不意味着它是静态。
2·Concern about the sustainability of global macroeconomic trends has been a persistent theme in intelligent comment since the mid-1990s.
自上世纪90年代中期以来，在有识之士的评论中，对全球宏观经济趋势可持续性的担忧一直是一个不变的主题。
3·Throughout China's very long history there has been a persistent theme of continuity and change - the former very tenacious, but the latter sometimes very drastic.
在中国漫长的历史中，一个永恒的主题是持续和变化——前者的力量很顽固，但后者有时非常激烈。
4·Seeing the various chronic and persistent problems in the 21st century, World Expo 2010 Shanghai China has chosen the theme "Better City, Better Life" to underline its courage and resolution.
面对21世纪的各大顽疾上海世博会将主题定为“城市，让生活更美好”，以此彰显了它的勇气和魄力。