What type of noun should always be capitalized?

As a language expert with a deep understanding of English grammar and usage, I can provide a comprehensive answer to your question regarding the capitalization of nouns. It is important to note that capitalization rules can be nuanced and there are certain types of nouns that are always capitalized. Here's a detailed explanation:

### Proper Nouns
Proper nouns are the names of specific individuals, places, organizations, or unique entities. They are always capitalized because they refer to a one-of-a-kind entity. Here are some examples:

- People: George Washington, William Shakespeare
- Places: Mount Everest, the Amazon River
- Organizations: United Nations, Apple Inc.
- Unique Entities: The Great Wall of China, the Eiffel Tower

### Nationalities and Languages
Nouns that refer to nationalities and languages are also capitalized. This is because they are derived from proper nouns, which are the names of specific countries or regions:

- Nationalities: American, Chinese, Australian
- Languages: English, Spanish, Mandarin

### Days of the Week, Months, and Holidays
The names of the days of the week, months, and many holidays are capitalized as they are considered proper nouns:

- Days of the Week: Monday, Tuesday, Wednesday
- Months: January, February, March
- Holidays: Christmas, Thanksgiving, Independence Day

### Titles of Works
When referring to the titles of works such as books, movies, songs, and paintings, the first letter of each major word is capitalized:

- Books: "To Kill a Mockingbird", "Pride and Prejudice"
- Movies: "The Godfather", "Star Wars"
- Songs: "Imagine", "Bohemian Rhapsody"
- Paintings: "The Starry Night", "Monalisa"

### Geographical Features
Certain geographical features are capitalized, especially when they are named after a proper noun:

- Mountains: Mount Everest, Mount Kilimanjaro
- Rivers: the Mississippi River, the Nile River
- Deserts: the Sahara Desert, the Gobi Desert
- Oceans: the Atlantic Ocean, the Pacific Ocean

### Historical Events and Eras
Nouns that denote historical events and eras are often capitalized:

- Events: the American Revolution, the French Revolution
- Eras: the Renaissance, the Middle Ages, the Industrial Revolution

### Brands and Products
The names of brands and products are capitalized because they are proper nouns that refer to specific entities:

- Brands: Coca-Cola, Nike, McDonald's
- Products: iPhone, Google Chrome, Microsoft Word

### Adjectives Derived from Proper Nouns
When an adjective is derived from a proper noun, it is also capitalized:

- Adjectives: Shakespearean, American, Victorian

### Capitalization in Sentences
In sentences, the first word is always capitalized, regardless of whether it is a noun or any other part of speech. This is a basic rule of English punctuation.

### Conclusion
In summary, proper nouns, nationalities, languages, days of the week, months, holidays, titles of works, geographical features, historical events, eras, brands, products, and adjectives derived from proper nouns are always capitalized. These rules help to distinguish these nouns from common nouns and provide clarity in written communication.

Now, let's proceed with the translation into Chinese.

These types of nouns are usually not capitalized (unless they begin a sentence or are part of a title).Proper nouns are the names of a specific person, place, or thing. The basic capitalization rule of proper nouns is that the first letters are capitalized.