คนงาน, เกียร์, การส่งผ่าน, งาน, ฟังก์ชัน, ขับรถ, ด้วยกัน, ปฏิสัมพันธ์, เทคโนโลยี, ทีม, กลศาสตร์
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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