บทคัดย่อ, มีสีสัน, เดสก์ทอป, พื้นหลัง, ดิจิตอล, สี, สีน้ำเงิน, แผนภาพสี, เส้น, การจัดการ, การควบคุม
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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