I will keep it in mind that you were by my side when I was in my worst time of my life.
在我人生最低谷的時候有你陪著我,我會銘記在心
附：“銘記在心”翻譯為keep in mind 或bear in mind.而不是"keep in heart"英語不這樣講.
it為形式賓語,指代“在我人生最低谷的時候有你陪著我”這件事.
“人生最低谷”可以翻譯為in my worst time of my life或I was at my lowest condition of my life./I was at the darkest time of my life.
"by my side"即在.身邊,或者用you keep accompany me /you were with me都可以表示在.身邊.