gǔ / rén / cháng / yòng / tún / quǎn / zhè / ge / cí / lái / qiān / chēng / zì / jǐ / de / ér / zi

古人常用“豚犬”这个词来谦称自己的儿子。

In ancient times, people often used “豚犬” to refer humbly to their own son.