There is no need to add articles before plural nouns
No need to add before abstract nouns, such as Honesty, ribery, etc. have no specific shape and cannot be expressed as “one”. Specific things, but the shape is not fixed, and “one” cannot be used to express
When used as the complement of a proper name, the noun is treated as a proper noun, both the subject complement and the object complement
The definite article The comes from that/those (that) and has the meaning of reference
There is only one proper noun that can be understood without adding The, so why add The to the unique sun Sun moon?
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There is a detailed explanation in the Grammar Club: Compound words similar to “the Great Wall” and “the sun” are interpreted as “that very great wall” and “the star called sun” that is to say, sun and moon are not Unique.