Male speaker giving presentation in lecture hall at university workshop. Audience in conference hall. Rear view of unrecognized participant in audience. Scientific conference event.

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Male Speaker Giving Presentation In Lecture Hall At University Workshop. Audience In Conference Hall. Rear View Of Unrecognized Participant In Audience. Scientific Conference Event. 免版權照片，圖片，畫像及圖片庫. Image 207087170.

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Male speaker giving presentation in lecture hall at university workshop. Audience in conference hall. Rear view of unrecognized participant in audience. Scientific conference event.

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