彼此非常了解用英语怎么说

"We know each other very well" 是一种表达方式，表示两个人非常了解对方。这句话的来源是英语中的常见短语，用来描述两个人之间的关系。
下面是一些例句：
"We've been friends for years, so we know each other very well."
"I've been working with John for a long time, so we know each other very well."
"My sister and I grew up together, so we know each other very well."
中文翻译如下：
"我们已经是朋友多年了，所以我们非常了解对方。"
"我和约翰一起工作很久了，所以我们非常了解对方。"
"我和我的妹妹一起长大，所以我们非常了解对方。"