下雨天增添思念下雨天更加想念
[xià yŭ tiān zēng tiān sī niàn xià yŭ tiān gèng jiā xiăng niàn]
It translates to 'rainy days add to my longing for you,' indicating how the rain can intensify emotions and bring back memories. It portrays nostalgia and deepened feelings especially in adverse weather.