บทคัดย่อ, เส้น, ถนน, เส้นโค้ง, สีเขียว, สีดำ, พื้นหลังสีดำ, ออกแบบ, พื้นหลัง, การเสนอ, รูปแบบนามธรรม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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