เบา, ส่องแสง, สีเหลือง, สีแดง, ความถี่, ซายน์, ฟิสิกส์, บิล, พื้นหลัง, สีน้ำเงิน, กราฟิก
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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