ช่องกระจายพลังงาน, กำแพงเขื่อน, คอนกรีต, ที่ไหล, การวิ่ง, พืชพันธุ์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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