- 1乳糖（食品標示上的「乳糖」；「乳糖不耐症」= lactose intolerance）
The natural sugar found in milk — cow's milk, human milk, and the milk of other . It is what makes plain milk taste sweet. Most students meet this word not in biology class but on food labels and in the phrase 'lactose intolerant': many adults, and a very large share of people in East Asia, stop making enough of the enzyme that breaks lactose down, so milk gives them stomach pain, gas, or . That is why supermarkets here sell 無乳糖 milk, and why 'lactose-free' appears on so many . The word itself is neutral and technical — it names the substance, not the problem. Note that lactose intolerance is not a milk allergy: intolerance is a problem and unpleasant; a milk allergy is the immune system reacting and can be dangerous.
組成From Latin 'lac' (milk) plus -ose, the ending chemists use for sugars — you can see the same ending in glucose, fructose, and sucrose. So the word is simply 'milk sugar', spelled in the language of chemistry.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
lactosenoun/ˈlæk.təʊs/
- 1
biochemistrybiologychemistryThe disaccharide sugar of milk and dairy products, C₁₂H₂₂O₁₁, a product of glucose and galactose used as a food and in medicinal compounds.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。