The national liability is adopted to animate the state to resolve the trans-frontier pollution in the beginning.

最开始时主张通过追究国家责任来促使国家解决越境的污染。

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The uncertainty on the property right of international environment resources makes the treatment of trans-frontier pollution difficult.

国际环境资源的产权之不确定，让越境污染的治理困境重重。

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"Although the link between air pollution and Alzheimer's disease is a new scientific frontier, we now have evidence that air pollution, like tobacco, is dangerous to the aging brain," he added.

“尽管空气污染和阿尔茨海默氏症之间的联系是一个新的科学前沿领域，但我们现在有证据证明，空气污染就像烟草一样，对不断老化的大脑有害，”他补充说。

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The arrangement will see the BP chartered anchor handling vessel "Grampian Frontier" being drafted in to help in the event of a marine pollution incident.

BBC: BP agrees to emergency tug deal