โรงงาน, การทำงานเป็นทีม, ผีเสื้อ, ความสะดวก, พื้นหลัง, เส้น, แปรง, ความร่วมมือ, งานกลุ่ม, ด้วยกัน, ชุมชน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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