科学素养与生活应用·英语30篇（4）

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蜂蜜为何永不腐败：其长期保存的科学原理

Honey’s low moisture content makes it inhospitable for most bacteria and molds to grow.
Its natural acidity, with pH between 3.2 and 4.5, further prevents microbial survival.
Bees add glucose oxidase enzyme to nectar, which produces hydrogen peroxide as a preservative.
Crystallization does not indicate spoilage but rather a natural physical change over time.
Archaeologists have found edible honey in ancient Egyptian tombs over 3,000 years old.
Heating honey above 60°C destroys beneficial enzymes but doesn’t affect shelf life.
Commercial honey is often filtered to delay crystallization without adding preservatives.
The sugar concentration is so high that it pulls water away from any contaminant cells.
Raw honey may contain pollen grains used for geographic traceability and quality testing.
Modern food labs use water activity meters to verify honey’s long-term stability.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Commercial honey is often filtered to delay crystallization without adding preservatives. 市售蜂蜜常经过过滤以延缓结晶，且不添加防腐剂。
Heating honey above 60°C destroys beneficial enzymes but doesn’t affect shelf life. 将蜂蜜加热至60°C以上会破坏有益酶，但不影响保质期。
Modern food labs use water activity meters to verify honey’s long-term stability. 现代食品实验室使用水分活度仪验证蜂蜜的长期稳定性。

这篇中文题目最接近哪一句？蜂蜜为何永不腐败：其长期保存的科学原理一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？蜂蜜含水量低，大多数细菌和霉菌难以在其内生长。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Honey Never Spoils: The Science Behind Its Shelf Stability How to cook noodles A maths worksheet

Commercial honey is often filtered to delay crystallization without adding preservatives.

Commercial honey is often filtered to delay crystallization without adding preservatives.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Commercial honey is often filtered to delay crystallization without adding preservatives.