Nà / duì / liàn / rén / zài / zhòng / rén / miàn / qián / méng / shān / shì / hǎi / biǎo / dá / le / xiāng / shǒu / yì / shēng / de / jué / xīn

那对恋人在众人面前盟山誓海，表达了相守一生的决心。

The couple pledged undying love in front of everyone, expressing their determination to stay together for life.