the most important cause or reason why something happens 主要原因；主要理由
Synonyms and related words
Causes: cause, catalyst, source...
Synonyms and related words
Reasons and excuses: reason, excuse, point...
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- huntsman 116
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- TOUR 138
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- colicky 101
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- studiously 51
- snippet 90
mainspring
noun [C] formal 
/ˈmeɪnˌsprɪŋ/
/ˈmeɪnˌsprɪŋ/ | singular | mainspring |
| plural | mainsprings |
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