However, more research is now needed to establish why the link exists.
但是，现在需要更多的研究，以确定其联系存在的原因。
Unfortunately, available evidence fails to establish any direct link between smoking and cancer.
不幸的是，现有的证据不能证明抽烟和癌症之间有直接的联系。
More research is clearly needed to establish a link between these two conditions.
为了明确两种情形的关系，有更多的研究要做。
The special envoy's visit establish a link between the two countries.
特使的出访在两国间建立了联系。
The special envoy's visit establish a link between the two countries.
特使的出访在两国间建立了联系。
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