พจนานุกรมภาษาอังกฤษชื่อดังอย่าง Merriam-Webster ให้ความหมายของจดหมายเปิดผนึกไว้ว่า ‘จดหมายแห่งการประท้วงหรือการร้องขอ’ ที่จั่วหัวถึงใครสักคน แต่ต้องการให้ถูกอ่านโดยสาธารณชน
10 min read
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