That is, we smile because we’re happy, but also to an extent we can make ourselves happier by smiling.

比如说，我们会因为开心而笑，在某种程度上，我们也会因为笑而变得开心。

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If we smile to her, she would also return the happiness to us.

如果我们对她微笑，她也会回报我们幸福。

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We are similar not only in appearance but also in the way we smile and walk.

我们不仅仅是外表相像，而且我们笑和走路的方式都非常相像。

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