Near synonyms for heartfelt can be refreshing, or moving.
Meaning of "heart-strings": used to describe something that y touches the heart. Or it refers to the strong ****ing in the heart caused by moving. Mostly refers to excitement.
Buckle: through the "knock", knocking, holding. Heartstrings: refers to the heart that is touched and causes ****ing.
Pinyin: kòu rén xīn xián, source: Wei Wei, The East, Part II, Chapter 7: "It is said that this man is the least talkative, but the few words he spoke on that day were so heart-stopping that he was moved to shed tears himself at that time." 例句：秦牧《花城-古董》："How heart-stopping that sight was."
The heartstrings of the sentence:
1, whenever the night falls, the square will be lively, the music also played, the passionate song heartstrings, people can not help but have to enter, dance a gorgeous dance.
2, like the gentle classical music, like the guzheng to introduce people into the kind of heart-stopping, like a dream, not a dream, out of the realm.
3, from the Dai Village out and saw the knife mountain, under the sea of fire, cockfighting, sheep fighting, horsefighting, flying car wall and other thrilling, heart-stopping performances.
4, the hometown is a beautiful song, it must be soothing and heart-stopping one.