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He is fishing for information by a letter of inquiry.
他写信询问，希望打听一下消息。
youdao
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We have received your letter of inquiry, we really appreciate that.
我们收到了您的咨询函，非常感谢。
youdao
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We have received your letter of inquiry, we really appreciate that.
我们收到了您的咨询函，非常感谢。
youdao