Food Preservation

Six ways to keep food safe and lasting · 食物保存六法

We don't give much thought to food in our modern era. It's just there as a part of our lives—bananas from Vietnam, grapes from California, and milk, meat and vegetables from local farms.

Our prehistoric ancestors would be jealous. For them, each day presented a challenge: hunt with success or starve. Periods of plentiful food were often followed by long periods of famine. There was no way to preserve food to be eaten later.

When it dies, a living organism is invaded by harmful bacteria that cause food to spoil. As it rots, it becomes toxic. This is where food preservation comes in.

The goal of food preservation is to destroy these harmful organisms. There are six main ways to do that: drying, pickling, canning, freezing, freeze-drying and irradiation.

Probably by accident, prehistoric humans discovered that some foods, when left out in the sun, did not rot. They had discovered food preservation. Over the centuries, drying techniques have been perfected. Furnaces, large fans, and artificial heat are now used. But the end result is the same—dried food that can last a long time.

Another ancient method of preserving food is pickling. Food is preserved in a solution of salt, which makes it impossible for bacteria to survive. Meats and vegetables can be preserved in this way.

By 1800, a new method came on the market—canning. Food is cooked at high temperatures to kill the bacteria. It is then put in a sterile container such as a can or a glass jar. The top is sealed to prevent air from entering. Canned food can last for 30 or 40 years, and still taste good.

Then, with the invention of freezers, large-scale food preservation became a reality. By cooling food to below freezing temperatures, bacteria are killed.

The latest method of food preservation is irradiation. Gamma radiation kills the bacteria, but the long-term effects of eating foods to which radiation has been applied are unknown.

Food preservation has come a long way, from drying in the hot sun to large-scale preservation in modern factories. However, the goal remains the same: to have long-lasting safe food to feed the people.

Food Preservation — From drying in the sun to modern irradiation · 食物保存六法

We don't give much thought to food in our modern era. It's just there as a part of our lives—bananas from Vietnam, grapes from California, and milk, meat and vegetables from local farms.

Our prehistoric ancestors would be jealous. For them, each day presented a challenge: hunt with success or starve. Periods of plentiful food were often followed by long periods of famine. There was no way to p(1)__________ food to be eaten later.

When it dies, a living organism is invaded by harmful bacteria that cause food to s(2)__________. As it rots, it becomes t(3)__________. This is where food preservation comes in.

The goal of food preservation is to d(4)__________ these harmful organisms. There are six main ways to do that: drying, pickling, canning, freezing, freeze-drying and irradiation.

Probably by accident, prehistoric humans discovered that some foods, when left out in the sun, did not rot. They had discovered food preservation. Over the centuries, drying techniques have been p(5)__________. Furnaces, large fans, and artificial heat are now used. But the end result is the same—dried food that can last a long time.

Another ancient method of preserving food is pickling. Food is preserved in a solution of salt, which makes it impossible for bacteria to s(6)__________. Meats and vegetables can be preserved in this way.

By 1800, a new method came on the market—canning. Food is cooked at high temperatures to kill the bacteria. It is then put in a s(7)__________ container such as a can or a glass jar. The top is s(8)__________ to prevent air from entering. Canned food can last for 30 or 40 years, and still taste good.

Then, with the invention of freezers, large-scale food preservation became a reality. By cooling food to below freezing temperatures, bacteria are killed.

The latest method of food preservation is irradiation. Gamma r(9)__________ kills the bacteria, but the long-term effects of eating foods to which radiation has been applied are unknown.

Food preservation has come a long way, from drying in the hot sun to large-scale preservation in modern factories. However, the goal r(10)__________ the same: to have long-lasting safe food to feed the people.

📌 重点单词 · Key Vocabulary

🔗 重点词组 · Key Phrases

💡 语法小贴士 · Grammar Tips

🥫 文化拓展 · The Story of Food Preservation

本文系统介绍了食物保存技术的演变史：从史前人类偶然发现的日晒干燥法，到古老的盐渍腌渍法，再到 1800 年问世的罐装法、冷冻法，直至最新的辐照技术。六种方法殊途同归——都是为了消灭有害细菌，让食物更长久、更安全地供人食用。

食物保存深刻地改变了人类文明。正因为有了保存技术，人类才得以度过饥荒、远航探险、迁徙定居。罐头发明于拿破仑时代，最初是为了解决军队远征的口粮问题；而冷冻技术的普及则彻底改变了现代人的饮食结构，让我们一年四季都能吃到世界各地的食材。

文章结尾点明主旨：无论技术如何进步，食物保存的目标始终未变——让安全、耐存的食物养活更多的人。这也提醒我们珍惜食物的来之不易，感恩从田间到餐桌的每一道工序。