การทำงานเป็นทีม, ทีม, กระดานดำ กระดานดำ, ชอล์ก, ส่วนบุคคล, กลุ่ม, เงา, ชาย, หญิง, ร่วมมือกัน, koorparativ
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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