Experts have long recognized that this discouraging problem has multiple causes.

专家们早就认识到，这个令人沮丧的问题是由多种原因造成的。

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This gets tricky because you can sometimes identify multiple causes for a problem.

这可能会比较麻烦，因为有时候可能会发现某个问题存在多个根源。

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Gaps in health outcomes have multiple causes, but poverty is the most pervasive factor.

健康结果方面的差距有众多原因，但贫穷是最普遍的因素。

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"This was a tragic accident, resulting from multiple causes and involving multiple parties, " he said.

NPR: BP Civil Settlement Remains Elusive As Trial Nears

When prices rise, there may be multiple causes, since there are many factors that drive the retail price paid at the market.

FORBES: Foods With The Biggest Price Increases

Teachers' increasingly critical stance toward their unions could have multiple causes.

WSJ: Peterson, Howell and West: Teachers Unions Have a Popularity Problem