"Warmth that has been long absent" 或者 "long-absent warmth" 都是可以用来形容久违的温暖的。这个短语是用来形容某个东西（通常是温暖或者爱）在一段时间以后才出现的。

下面是一些例句：

She felt the long-absent warmth of the sun on her skin and closed her eyes, savoring the moment. (她感受到了久违的阳光温暖，闭上眼睛，享受着这一刻。)
After a long, cold winter, the flowers finally blossomed, bringing a sense of long-absent warmth to the garden. (在漫长寒冷的冬天之后，花儿终于开放了，给花园带来了久违的温暖感。)
He hugged his mother, feepng the long-absent warmth of her embrace after so many years apart. (他拥抱着母亲，感受到了多年分离后久违的拥抱温暖。)