Something the kid taught me.

Last year Iin the subway station, before the gateway (do you mean 'turnstile'?) I saw a boy, sitting on the bench, who was guzzling many packs ('bars' or 'packets' sounds better here) of chocolate.

Later, with a short period watching him After watching him for a while, I couldn't help but move toward him and suggested approach him and say: "Kid, having too much sugar isn't good for your health."
He glanced at me with disdain. Then, instead of a reply, he asked me abruptly: "Do you know why my grandfather can was able to live over hundred years?"
I curiously Curious, I replied: "Oh, really? It is attributed to chocolate? (either "Can it be attributed to chocolate?" or "Was it because of chocolate?") 

"Because he never mind others' he always minded his own business.", Hhe said coldly.

*or "Because he never put his nose in other peoples' business."

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Something a kid taught me.

Last year, in the subway station before the gateway, I saw a boy sitting on a bench guzzling down many packs of chocolate. 

Later, after watching him for a short period of time, I felt compelled to approach him and suggest to him: "Kid, having too much sugar isn't good for your health."
He glanced at me with disdain. Then, instead of a reply, he asked me abruptly: "Do you know why my grandfather can live to be over a hundred years old?"
I curiously replied: "It is attributed to chocolate?" 

"No, because he never mind other people's business." He said coldly.

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Thanks for helping me out! If you want to learn Mandarin or Chinese culture, I'm willing to give you assistance. And as I'm a Taiwanese, there is no problem I can use both simple and traditional characters! Feel free to ask me any question!