爱情是人类永恒的话题之一。
爱情是人类永恒的话题，也是古代文学研究中的最重要的课题之一。
Love is one of the eternal topics of human beings and also one of the most important research subjects of ancient Chinese literature.
爱情一直是人类永恒的话题，只要有人类的存在，爱情必然是人类共同追寻的目标。
Love is the eternal theme for people. As long as love exists, love will be the objective pursued by all the people.
幸福，正如爱情一样，是人类永恒的话题。
This is happiness, and just like love, it is an eternal topic of human beings.
幸福，正如爱情一样，是人类永恒的话题。
This is happiness, and just like love, it is an eternal topic of human beings.
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