财富与幸福之间的关系是一个永恒的话题，不同时代的许多哲学家都讨论过这个话题。
The relationship between wealth and happiness is a constant topic that has been discussed by many philosophers of different times.
美国的扩张主义是一个永恒的话题。
旧城改造、房屋拆迁似乎是一个永恒的话题。
Transformation of the old city, Housing Units appears to be an eternal topic.
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