บันทึกเพลง, notenblatt, ช้อน, การสะท้อน, กระดาษ, การศึกษา, ใกล้ชิด, นาฬิกา, เวลา, วัตถุหนึ่งชิ้น, การเรียนรู้
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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