What is the precise meaning of the following query to Google Scholar: apple +computer?

Question

BlackTom AI · Accepted Answer

A leading plus sign (+) before a search term marks that term as required; an unmarked word is treated as optional.

1) Relevant knowledge points and concepts
- Search operators: in Google/Google Scholar syntax, prefixing a word with + requires that word to appear in returned documents. 
- Unprefixed words are not forced; the search engine may return documents whether or not they contain those words (they act as optional or ranking signals).
- Phrase search requires quotes ("apple computer") rather than a bare space or operator.

2) Step-by-step reasoning
- Tokenize the query: two tokens appear: apple and +computer.
- Interpret +computer: the plus forces the term computer to be present in every result.
- Interpret apple (no operator): it is optional — results may or may not contain apple; if present it may improve relevance but is not mandatory.

3) Example illustrating intermediate steps
- Doc A contains only "computer" → matches (computer is present).
- Doc B contains only "apple" → does not match (computer is missing).
- Doc C contains both "apple" and "computer" → matches.
This demonstrates that computer is required and apple is possible but not required.

4) Why the correct answer is correct
- Option d states results will “possibly” contain "apple" and “definitely” contain "computer," which exactly reflects the semantics of an unprefixed token plus a +-prefixed token.

5) Why the other options are incorrect
- a: implies equal, nondistinguished treatment of both terms (“about apples and/or computers”) — incorrect because +computer makes computer mandatory. 
- b: claims apple is required and computer optional — reversed roles, incorrect. 
- c: claims an exact phrase "apple computer" — phrase search would require quotes; this bare query does not force an exact phrase. 
- e: says + is illegal — incorrect; + is a legal operator to require a term.

Conclusion: The correct interpretation is option d: find articles possibly containing the word "apple" and definitely containing "computer", matching the provided answer.

What is the precise meaning of the following query to Google Scholar: apple +computer?单项选择题

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