执手在盛夏的阳光落笔在寒冬的白雪
[zhí shŏu zài shèng xià de yáng guāng luò bĭ zài hán dōng de bái xuĕ]
Describes a touching scene where holding hands under the blazing summer sun is contrasted with writing/leaving marks in winter's white snow - evoking strong imagery around enduring relationships and emotions changing with seasons but staying significant over time.