片段 2｜核心逻辑：HLB匹配 + 油脂选型
High-resolution talking-head video, fixed camera, upper body visible,
neutral professional laboratory lighting,
overall brightness high and even, no overexposure,
background lab bench and 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,
@wuchangwen looks directly into camera and speaks calmly and professionally:
“修护不闷，关键看两点：第一，HLB值是否匹配油相结构——HLB一偏，油脂只能浮在表面；第二，油脂选型要轻感而非堆量。修护靠的是脂质相容性，不是矿油和封闭剂硬压。” — while holding a matte-white molecular model of squalane in his left hand, and pointing with his right hand to a digital HLB reference chart on a tablet (screen abstracted, no readable numbers). Scene set in a raw material testing lab with centrifuge 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