ข้อเสนอแนะ, กลุ่ม, การสื่อสาร, ความคิดเห็น, ทบทวน, การประเมินผล, ทีม, การร่วมมือ, การสนทนา, การพูด
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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