ต้องห้าม, ควัน, การเตือน, สัญญาณ, ป้ายเตือน, อันตราย, หญ้า, สีเขียว, สัญลักษณ์, ป่า, ไม่มีคน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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