片段 2｜正确三步逻辑：保湿 + 微控 + 屏障
High-resolution talking-head video, fixed camera, upper body visible, neutral professional laboratory lighting, overall brightness high and even, no overexposure, background lab environment clearly visible with normal exposure, male researcher @wuchangwen, wearing white lab coat and white shirt, clean, professional scientific appearance, facial skin clean, smooth, hydrated, elastic, skin looks healthy, well-conditioned, and naturally radiant, fair skin tone with subtle rosy undertone, no beard, no stubble, no beard shadow, clean-shaven, no wrinkles, no dullness, no yellow or gray cast, skin clarity high, texture natural and realistic, high luminance with highlights preserved, image sharp and clear, no blur, no softness, no haze, 语速急促 @wuchangwen looks directly into camera and speaks calmly and professionally:
“正确的控油是三步：一，保湿托底——水稳了，油才不乱；二，微控分泌，比如烟酰安调节律、PCA锌减异常出油；三，维护屏障，神经酰安补脂修护。控油的终点不是 柑，是平衡。” — while holding a 3D molecular model of ceramide NP in his left hand, and pointing with his right hand to a tray of three opaque ingredient vials labeled only by color caps (blue = niacinamide, green = PCA-Zn, white = glycerin). Scene set in a raw material compatibility lab with barrier function tester in background. Negative prompt: overexposure, blown highlights, clipped whites, beard, stubble, beard shadow, beauty filter, over-smoothing, pore blur, yellow skin, dull skin, dark skin, cinematic lighting, film look, blur, soft focus, text, label, paper, transparent liquid, readable display