Genuine smiles in general are attractive.

真诚的笑容通常都是很迷人的。

youdao

Genuine smiles, on the other hand, are generated by the unconscious brain, so are automatic.

真正的微笑，另一方面，所产生的无意识大脑，所以是自动的。

youdao

Genuine smiles are known as Duchenne smiles after the 19th-century neurologist who defined them in detail.

真实的微笑被称为杜兴微笑。19世纪的神经学家杜兴对其进行了详细定义。

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But there is a difference between social smiles and genuine smiles.

FORBES: The Smiles of CEOs under 40

To my eye, there are four genuine smiles.

FORBES: The Smiles of CEOs under 40

And perhaps, when Arab kings and presidents meet in Qatar later this month, their smiles will be genuine.

ECONOMIST: Arab diplomacy and the Palestinians