That girl is the most happy- go- lucky person I know. 那个女孩是我所认识的人当中最无忧无虑的人。
He began to talk and laugh, in happy, thoughtless, boyish fashion, as we walked along, and made himself old friends with me at once. 我跟他往前走着,他就谈笑起来,高高兴兴的,无忧无虑的,非常孩子气,还真是跟我一见如故。