กลศาสตร์, เกียร์, ขับรถ, ด้วยกัน, ชุมชน, การส่งผ่าน, กลุ่ม, อุตสาหกรรม, โดยรวม, การทำงานเป็นทีม, เทคโนโลยี
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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