OT, ไฟใยแก้วนำแสง, ศูนย์, จุด, แหล่งกำเนิดแสงสี, มยูข, ผลแสง, สี, วงกลม, ทิศทาง, มีสีสัน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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