be on very intimate terms with each other;be hand and [in] glove with each other;be thick with sb.;closely united;as thick as thieves;

Joan was delighted to welcome her boyfriend into the bosom of her large, close-knit family.
琼十分高兴地欢迎她的男朋友加入她亲密无间的大家庭。
来源:《柯林斯高阶英汉双解学习词典》They conversed with the familiarity of a long-established acquaintance.
他们俨然如老相识一样亲密无间地攀谈了.
来源:互联网摘选Several of those arrested this week were Mr Khatami's close advisers.
本周被逮捕的人中都是哈塔米先生亲密无间的顾问.
来源:互联网摘选Izumi and I had a strictly compartmentalised yet totally intimate relationship.
泉和我保持着一种泾渭分明却又亲密无间的关系.
来源:互联网摘选
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