Explanation Mend: die out. The mind of a virgin has not yet been obliterated, describing a person who is old but still has an innocent heart.

Pronunciation tóng xīn wèi mǐn?

Origin: Song - Lu You "Made in the Garden" "In front of the flowers, I laugh at the childishness, and I am even more accompanied by the group of children who are laughing at the bamboo horses."

Specifically referring to those who have a child's trait of mentality, state of mind, personality, and interest in a class of people, their innate childish complex, always maintaining a sense of resistance to the steel forest; even if the appearance of the inevitable maturity, but also to retain a corner of the child inside.

Example sentence is back to being the old childish kid he used to be.