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航空信 (hángkōng xìn) refers to a type of postal service that delivers letters and packages by air. It is appropriate to use 航空信 when you need to send urgent or important mail that requires fast and reliable delivery. This can include documents, letters, and small packages.
航空信 is commonly used for international mail, as it is faster and more efficient than traditional mail services. It is also suitable for domestic mail when time is of the essence, such as sending time-sensitive documents or gifts.
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