谁能帮我分析一下这句英文,In her own past behaviour,there was a constant source of vexation and regret; and in the unhappy defects of her family a subject of yet heavier chagrin.她经常为自己以往的行为感到苦恼和悔恨,家庭里面种种不幸的缺陷更叫她苦闷万分.怎么用in？

谁能帮我分析一下这句英文,
In her own past behaviour,there was a constant source of vexation and regret; and in the unhappy defects of her family a subject of yet heavier chagrin.
她经常为自己以往的行为感到苦恼和悔恨,家庭里面种种不幸的缺陷更叫她苦闷万分.
怎么用in？