คณะกรรมการ, กระดานดำ, คำ, บังคับ, พลังงาน, ความโน้มน้าวใจ, ความเชื่อมั่น, กระดานชนวน, ชอล์ก, เขียน, ความหมาย
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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