ข้อต่อลูกทรงกลม, ลูกตุ้ม, ลูก, มันเงา, ลูกบอลทรงกลม, ฟิสิกส์, ลูกตุ้มนิวตัน, การสะท้อน, ระงับ, 3d, เนื้อไม้
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