似水流年许你一生流年似水陪你一世
[sì shuĭ liú nián xŭ nĭ yī shēng liú nián sì shuĭ péi nĭ yī shì]
'Water-like flowing years promising you my whole life, water-like flowing years accompanying you for a lifetime.' A poetic way of committing to lifelong devotion and support to someone important, no matter what happens in life.