คน, วัตถุ, เครื่องมือ, อุตสาหกรรม, การศึกษา, พื้นหลัง, โลก, เปลี่ยว, การชี้, ติด, ครู
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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