การสอน, การศึกษา, โรงเรียน, สีเขียว, คณะกรรมการ, ว่างเปล่า, ศิลปะ, บอร์ด, ชอล์ก, คำพูด, ความฉลาด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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