Qīngchūn shíqī de àiliàn zǒng shì nàme kègǔmíngxīn.
First love during youth always leaves such a deep impression.
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usage
爱恋 combines 爱 (love) and 恋 (attachment/longing), giving it a more poetic, yearning quality than plain 爱. Often used in literary or romantic contexts to suggest deep emotional attachment.