科学素养与生活应用·英语30篇（3）
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Why Soap Removes Grease from Hands
为什么肥皂能洗掉手上的油污
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Grease does not mix with plain water.油脂不溶于清水。
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Soap molecules have one end that likes water and one that likes grease.肥皂分子一端亲水，一端亲油。
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The grease-loving ends grab oil and lift it off skin.亲油端抓住油脂并将其从皮肤上剥离。
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The water-loving ends keep the oil suspended in water.亲水端使油脂悬浮在水中。
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Rinsing washes away the soap-and-grease mixture.冲洗可将肥皂与油脂的混合物冲走。
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Hot water helps melt grease but isn’t needed for cleaning.热水有助于融化油脂，但清洁并非必需。
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Antibacterial soap isn’t necessary for most handwashing.大多数洗手场景无需使用抑菌肥皂。
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Washing for 20 seconds removes most germs and dirt.洗手20秒即可清除大部分细菌和污垢。