High-resolution scientific talking-head video,
fixed camera, locked framing, upper body visible,
no camera movement,
professional laboratory lighting optimized for short-video platforms,
global brightness intentionally elevated,
facial skin exposure locked as absolute priority,
no overexposure, no clipped whites,
highlights preserved on face and lab surfaces,
full laboratory environment visible and clear,
background brightness capped below facial exposure,
no blown highlights anywhere in frame,
female researcher @liuyan7,
wearing white lab coat and white shirt,
clean, professional, scientific appearance,
facial skin in ideal healthy condition,
skin smooth, elastic, hydrated, refined,
fine lines visually softened by lighting,
no emphasized wrinkles,
complexion corrected to remove yellow or gray cast,
fair skin with healthy pink undertone,
white-and-pink clarity, translucent and bright,
skin looks clean, even, and youthful,
natural skin only, no makeup, no lipstick, no blush,
skin quality achieved by lighting and exposure only,
no beauty filter, no artificial smoothing,
image sharp, high micro-contrast,
facial details clear even after platform compression,
no blur, no haze,
@liuyan7 轻点容器，补充道：“同时把体系 pH 压在3.5以下，减少氧化速率；
配合避光的小规格包装，并少量复配VE，作为辅助稳定因子。”镜头拉远，展示整排封装好的样品，背景灯光渐暗，突出稳定体系的构建过程。
@liuyan7 调整pH计读数至3.5以下，将样品装入棕色小规格安瓿瓶，再放入避光盒中。