Parental love is deep and true.

父母之爱深而真挚。

《新英汉大辞典》

Yet children, also fearing their parents' punishment and the loss of parental love, come to repress most aggressive impulses.

然而，孩子们也害怕父母的惩罚和失去父母的爱，因此他们会抑制最具攻击性的冲动。

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Parental love and care can keep juvenile crimes low.

家长们的关爱可以使的青少年犯罪率下降。

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My own best guess about the asymmetry of parental love lies in a metaphor borrowed from the sciences.

BBC: A Point of View: The pain when children fly the nest

"Romantic love and parental love are overlapping systems, " says Parrott, who has studied jealousy and envy for more than 25 years.

CNN: I'm jealous of my baby -- a Mother's Day confession

Parental love, I think, is infinite.

BBC: A Point of View: The pain when children fly the nest