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Use mathematical metaphor
True love is great; It has nothing to do with poverty (-∞) or wealth (+∞).

True love is eternal; Whether in the past (-∞) or in the future (+∞).

True love is selfless; Whether it is a small matter (-∞) or a big matter (+∞), they all contribute to each other.

True love is happy; No matter pain and failure (-∞) or happiness and success (+∞), we should share them with each other.