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Environmental concerns are also an obstacle: America, for one, has banned oil production off most of its coastline.

另一个障碍是环保方面的关切：比如说美国，就已经禁止在大部分近海区域开采石油。

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But fatal accidents are hardly uncommon. Jumping off Trollveggen was banned after 11 accidents and four deaths in the space of 280 jumps in the early 1980s.

但致命事故也不少发生，在80年代早期的280次跳崖中发生的11起意外4人死亡导致了从Trollveggen跳崖的禁止。

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After retiring from racing, he became a trainer at Lambourn, but his racing life came to an abrupt halt in October 1992, when the Jockey Club warned him off (banned him) for 10 years.

BBC: Dermot Browne profile

In exchange, Brownback backed off amendments that would have banned human cloning and prohibited creating animal-human hybrid embryos.

CNN: Senators defer fight on stem cell research

Why should using an iPad, Kindle or bag-holding alarm clock be banned during take-off and landing, even with all wireless comms switched off?

ENGADGET: FAA to take 'fresh look' at gadget restrictions on flights