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1.and there has not been any way to understand how these things contribute to the disease.
contribute to 有助于；捐献；促成
She is exuberating in the knowledge of having contributed to victory.
她知道自己对胜利有所贡献而显得沾沾自喜。
Natural disasters have obvi-ously contributed to the continent's economic crisis.
很显然，自然灾害也是造成该大陆经济危机的原因之一。
