关于英文标题字母大小写的法则

转自维基百科，相信蛋疼此问题的亲们也不需要翻译了吧

Headings and publication titles

In English-language publications, varying conventions are used for capitalizing words in publication titles and headlines, including chapter and section headings. The rules differ substantially between individual house styles. The main examples are (from most to least capitals used):


Example

All-uppercase letters:
THE VITAMINS ARE IN MY FRESH CALIFORNIA RAISINS

"Start case" — capitalization of all words, regardless of the part of speech:
The Vitamins Are In My Fresh California Raisins

Capitalization of all words, except for articles, prepositions, and conjunctions:
The Vitamins Are in My Fresh California Raisins

Capitalization of all words, except for articles, prepositions, conjunctions, and forms of to be:
The Vitamins are in My Fresh California Raisins

Capitalization of all words, except for closed-class words:
The Vitamins are in my Fresh California Raisins

Capitalization of all nouns and the first word:
The Vitamins are in my fresh California Raisins

Capitalization only of nouns:
the Vitamins are in my fresh California Raisins

Sentence case – Capitalization of only the first word, proper nouns and as dictated by other specific English rules:
The vitamins are in my fresh California raisins

Mid-sentence case – capitalization of proper nouns only:
the vitamins are in my fresh California raisins

All-lowercase letters (unconventional in formal English):
the vitamins are in my fresh california raisins


Among U.S. book publishers (but not newspaper publishers), it is a common typographic practice to capitalize "important" words in titles and headings. This is an old form of emphasis, similar to the more modern practice of using a larger or boldface font for titles. Most capitalize all words except for closed-class words, or articles, prepositions and conjunctions. Some capitalize longer prepositions such as "between", but not shorter ones. Some capitalize only nouns, others capitalize all words. This family of typographic conventions is usually called title case. Of these various styles, only the practice of capitalizing nouns, pronouns, verbs, adverbs and adjectives but not articles, conjunctions or prepositions (though some styles except long prepositions) is considered correct in formal American English writing, according to most style guides, though others are found in less formal settings.

As for whether hyphenated words are capitalized not only at the beginning but also after the hyphen, there is no universal standard; variation occurs in the wild and among house styles (e.g., The Letter-Case Rule in My Book; Short-term Follow-up Care for Burns). Traditional copyediting makes a distinction between "temporary compounds" (such as many nonce [novel instance] compound modifiers), in which every word is capped (e.g., How This Particular Author Chose To Style His Autumn-Apple-Picking Heading), and "permanent compounds", which are terms that, although compound and hyphenated, are so well established that dictionaries enter them as headwords (e.g., Short-term Follow-up Care for Burns).

The convention followed by many British publishers (including scientific publishers, like Nature, magazines, like The Economist and New Scientist, and newspapers, like The Guardian and The Times) is to use sentence-style capitalization in titles and headlines, where capitalization follows the same rules that apply for sentences. This convention is sometimes called sentence case. It is also widely used in the United States, especially in newspaper publishing, bibliographic references and library catalogues. Examples of global publishers whose English-language house styles prescribe sentence-case titles and headings include the International Organization for Standardization.

In creative typography, such as music record covers and other artistic material, all styles are commonly encountered, including all-lowercase letters and mixed case (StudlyCaps).

Several information technology products are titled in CamelCase, deriving from a computer programming practice.

One British style guide mentions a form of title case: R.M. Ritter's "Oxford Manual of Style" (2002) suggests capitalizing "the first word and all nouns, pronouns, adjectives, verbs and adverbs, but generally not articles, conjunctions and short prepositions".