一步一步简单陪你走一生一世平凡陪你过
[yī bù yī bù jiăn dān péi nĭ zŏu yī shēng yī shì píng fán péi nĭ guò]
Translates to a simple and ordinary promise of walking alongside someone through life's journey, step by step. This suggests cherishing simplicity and staying with a loved one through thick and thin.