情侣山盟海誓天长地久永垂海誓山盟甜言蜜语经久不衰
[qíng lǚ shān méng hăi shì tiān zhăng dì jiŭ yŏng chuí hăi shì shān méng tián yán mì yŭ jīng jiŭ bù shuāi]
Translating roughly as 'Couple's oaths stronger than mountains and seas, lasting forever; vows and sweet words that will remain eternal.', this portrays an intensely romantic relationship characterized by grand promises, deep love and timeless affection between two partners.