伱的过去我不曾参与伱的未来我便要参与
[nĭ de guò qù wŏ bù céng cān yŭ nĭ de wèi lái wŏ biàn yào cān yŭ]
Means 'I was not part of your past, but I intend to be part of your future'. It indicates hope and anticipation to play a role in shaping the future together, emphasizing commitment and forward-looking intention.