It is necessary to find out its cause.
研究其产生的原因非常必要。
To find out its cause, the main risks of new products' failure originate from the chanciness of market.
究其原因，新产品失败的主要风险来自于市场的不确定性。
The bottom line of overcoming the spread of this infectious disease is to find out both its cause and its vehicle as soon as possible.
抑制这种传染性疾病蔓延的关键是尽快找到病因及传染媒介。
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