吸收顺序与分子大小、极性及配方载体相关，因此「先稀后稠」的涂抹次序是有依据的。

实操上：质地轻薄的先上，质地浓厚、含油量高的后上，即由稀到稠——修护水 → 修护乳 → 修护霜。

把厚重的先糊上去，轻薄的就进不去了，这是很多人觉得「涂了没用」的技术原因。

Order depends on molecular size, polarity and vehicle — hence 'thin to thick': repair water → repair lotion → repair cream.

Applying the thickest first blocks the lighter products from penetrating, a common reason people feel their routine 'does nothing'.