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A cheerful and attractive American female influencer is doing a livestream product promotion, holding a bottle of "Glow Radiance Vitamin C Serum" and presenting it to the camera. She speaks in fluent English with a natural American accent, using a lively, friendly, and persuasive tone like a professional livestream seller. She smiles warmly, maintains eye contact with the camera, and uses natural hand gestures while talking. She says: "This Vitamin C serum gives your skin such a beautiful glow! It’s lightweight,…