เกียร์, ฟังก์ชัน, ปฏิสัมพันธ์, ทีม, กลุ่ม, การทำงานเป็นทีม, ชุมชน, ด้วยกัน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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