tā / men / qǐng / yé / ye / dān / rèn / zhèng / hūn / rén / jiàn / zhèng / zhè / ge / zhòng / yào / shí / kè

他们请爷爷担任证婚人，见证这个重要时刻。

They asked Grandpa to be the wedding witness and witness this important moment.