Mr Singh’s main response has been a shrug and a twinkly smile.

辛格先生最主要的回应是耸耸肩，微微一笑。

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"If he saw his pictures around the world's airports and underground stations," says Atkinson, "he would have given his characteristic response: a rather wry and slightly mischievous smile."

“如果他看见他的照片出现在国际机场和地铁里面，他可能早就给出他的独特的回应了：一个嘲讽的顽皮的笑。”Atkinson说。

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For most, though, the question brought a smile and a thoughtful response.

不过对大多数人，这个问题让他们会心一笑，我也得到了一些引人思考的答案。

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Mr Singh's main response has been a shrug and a twinkly smile.

ECONOMIST: Indian politics

Marco Iacoboni, a lab director at the UCLA Brain Mapping Center, says when people see a smile, so-called mirror neurons fire in their brain and evoke a similar neural response as if they were smiling themselves.

WSJ: Stress-Busting Smiles