After all, what is the one modern form of expression almost completely dedicated to depicting happiness?
one在这里强调唯一性、重要性,可以参考词典上相关释义和例句。
one: used for emphasis to mean ‘the only one’ or ‘the most important one’
He's the one person I can trust. (Oxford)
one可以去掉,去掉后少了这层强调的意味。
勤查词典,必有所获!