As long as high fishing efforts exist in the Yellow Sea, it is impossible for the stock to recover and to reach maximum sustainable yield.

只要黄海周围过高的捕捞力量的存在，小黄鱼资源很难得以恢复并达到最大持续产量。

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The birds are being fed locally-bought sprats while fishing in the Caspian is impossible.

BBC: Trapped Dalmatian pelicans hand-fed in frozen Caspian Sea

Behaviour patterns found at all sites were deemed as likely to be genetic as cultural (leaf-sponging turned out to be in this category), as were those whose absence was due to some environmental factor (fishing algae out of ponds is impossible where there are no algae to fish).

ECONOMIST: Chimpanzee behaviour: Culture club | The