玛丽亚认为她不善于当面表达自己的感情，所以她给父亲写了一封信。

Maria doesn't think she is good at telling her feelings face to face, so she writes a letter to her father.

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我给玛丽寄了一封信。

I sent a letter to Mary.

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我给玛丽寄了一封信。

I sent a letter to Mary.

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