This is inherent in the animal, a survival instinct, and the emotional pain caused by separation for good reason.

这是动物固有的世代相传的本能，生离死别永远会导致精神痛苦。

youdao

This is inherent in the animal, a survival instinct, and the emotional pain caused by separation for good reason.

这是动物固有的世代相传的本能，生离死别永远会导致精神痛苦。

youdao