很多人喜欢穿白衣服，然而让人苦恼的是，穿一段时间后，白衣服总逃不过发黄的宿命，尤其是领口、袖口，十分影响美观。 这到底是怎么回事？怎么才能避免白衣服发黄呢？已经发黄的衣服又怎样才能白回来？ The Property of the Property of Children the local of the later 白衣服为什么会变黄？ 仔细观察发黄的衣服，你会发现，衣服发黄有的是局部区域，有的是整体均匀的发黄，可见发黄只是结果，导致发黄的原因其实多种多样，甚至还有点复 杂。 汗渍皮脂残留污染 人体的皮肤无时无刻不在分泌汗液，但汗液并不只有水分，还有皮脂（油脂）、皮屑（蛋白质），它们在被空气氧化后会慢慢生成黄色物质，而且越不及时 清洗这种发黄越难洗干净，因为皮脂皮屑在氧化后也会慢慢地变得疏水，甚至彼此交联结块，更加难以洗掉。 材料本身易泛黄 衣服的面料成分多种多样，其中就有些面料材料本身特别容易发黄，例如锦纶（尼龙）、氨纶、蚕丝、羊毛。这些材质都有一个共同点，那就是它们的化学 结构中含有"氨基（-NH2）"，这个结构容易在空气中被氧化形成发黄的颜色。 菌渍繁殖导致 纺织品如果清洁、储存不当，上面滋生的细菌在繁 ...

Core Viewpoint - The article highlights the dual nature of the medical knowledge dissemination ecosystem on social media, where some medical professionals misuse their authority for commercial gain, leading to the need for regulatory measures to ensure ethical practices in health-related content [5][10][12]. Group 1: Medical Professionals and Commercialization - Some medical professionals are using their authority to promote non-medical products, such as hand creams and dietary supplements, under the guise of health education [5][6]. - Certain influencers are misrepresenting their professional identities by using titles like "doctor" or wearing lab coats to gain credibility while promoting products [7][10]. - There are instances where medical professionals provide misleading information or promote unrelated products, such as a urologist discussing foot fungus treatments, which raises ethical concerns [8][10]. Group 2: Regulatory Measures - In March, Shanghai introduced the first "negative behavior list" for internet health education, outlining prohibited actions such as disguised product promotion and collaboration with disreputable agencies [5][11]. - The article mentions that existing laws already impose strict regulations on medical advertising and the conduct of medical professionals online, including penalties for impersonating doctors or providing unauthorized medical advice [11][12]. - The need for a return to the altruistic roots of medical practice is emphasized, advocating for a healthier online environment that prioritizes public benefit over commercial interests [12].