คณะกรรมการ, ชอล์ก, สีดำ, การศึกษา, เรียน, ป้าย, สกปรก, ว่างเปล่า, สะอาด, โรงเรียน, ห้องเรียน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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