夏花已是旧时光里的砂砾
[xià huā yĭ shì jiù shí guāng lĭ de shā lì]
Which implies 'summer flowers have become the gravel of old times'. Summer flowers usually suggest beauty, brilliance, but when used in conjunction with 'old times' and 'sand', the user wants to express nostalgia for something that once bloomed in their life but has long since vanished, leaving faint memories and a bittersweet aftertaste.