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TOEFL BNC: 34688 COCA: 39681

the most important reason for something; the thing that makes something else happen主要原因;主要动力

Work was the mainspring of his life.工作是他生活的主要动力。
TOEFL BNC: 34688 COCA: 39681
TOEFL BNC: 34688 COCA: 39681
TOEFL BNC: 34688 COCA: 39681
mainspring
Causes: cause, catalyst, source...
Reasons and excuses: reason, excuse, point...

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