xìn / de / jié / wěi / xiě / zhe / jìng / hòu / yù / yīn / yǔ / qì / shí / fēn / gōng / jìng

信的结尾写着“敬候玉音”，语气十分恭敬。

The letter ends with “I respectfully await your reply,” giving it a very respectful tone.