牵着你的手天涯海角拉着你的手白头偕老
[qiān zhe nĭ de shŏu tiān yá hăi jiăo lā zhe nĭ de shŏu bái tóu xié lăo]
'Holding your hand from one end of heaven to the other, growing old together with your hand in mine' conveys commitment in romantic relationships, symbolizing unwavering love leading to lifelong companionship.