bức vẽ, Mỹ nghệ, nghệ thuật, vẽ, đang vẽ, vẽ bằng tay, bản phác thảo, phòng thí nghiệm, Phòng thí nghiệm điện tử, Công nghệ, bức tranh kỹ thuật số
Public Domain
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