用我一生盛世换你一世阑珊
[yòng wŏ yī shēng shèng shì huàn nĭ yī shì lán shān]
The meaning here suggests exchanging one's lifetime of prosperity (my lifetime glory) for just one lifetime (theirs, perhaps someone loved one) full of decline. In other words, it implies a deep sacrifice to ensure a different destiny or condition for someone else.