การศึกษาผู้ใหญ่, เขียน, ความรู้, อำนาจ, คณะกรรมการ, มือ, เรียน, บันทึก, การอบรม, ทักษะ, อาชีพ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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