信 (xìn) means “letter; mail; to trust; to believe; to profess faith in; truthful; confidence; trust; at will; at random”. It is an HSK 2 Chinese character in the HSK 3.0 vocabulary.
Measure word: 封
我收到了他的信。
Wǒ shōudào le tā de xìn.
I received his letter.
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