Rawlins stresses that it is impossible to prove a causal link between the drug and the deaths.

罗林斯强调说证实毒品与死亡之间的因果关系是不可能的。

《柯林斯英汉双解大词典》

At best there is a weak statistical association and not a causal link between DNA and intelligence.

DNA 和智力之间最多只存在着微弱的统计关联，而不是因果关系。

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Glass cautions that most studies don't necessarily prove a causal link between greenness and health, but they're nonetheless helping spur action.

格拉斯提醒说，大多数研究并不一定能证明绿色与健康之间的因果关系，但它们仍然有助于激励人们采取行动。

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This implausible causal link was drawn on the very day of the city's deliverance.

BBC: Part Two - France and Memory

But Justice Minister Crispin Blunt said experts were divided on whether any causal link existed.

BBC: Minister rebuts MPs' claim on effectiveness of prison

Without a causal link between the failure to investigate and the loss, is there no manager liability?

FORBES: Money Manager Use of Tainted Wall Street Research (Oct 1, 2002 )