At the current rate of decline, many of the rain forest animals could become extinct in less than 10 years.

按照目前的下降速度，许多雨林动物不到十年就会绝种。

《柯林斯英汉双解大词典》

However, it is announced that the Chinese paddlefish living in the Yangtze River has become extinct (灭绝) .

然而，据报道，生活在长江的中国白鲟已经灭绝。

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We must protect these endangered animals before they become extinct.

在这些濒危动物灭绝之前，我们必须保护它们。

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Atlantic bluefin tuna is being overfished and there are fears it could become extinct.

VOA: standard.2010.03.04

And, yes, the coral reefs might become extinct, and people from the Seychelles might go hungry.

NEWYORKER: The Climate Fixers

But as sure as rampaging dinosaurs have become extinct, the days of outsized-living CEOs are over.

FORBES: Boardroom Bad Boys

Hair experts believe that haircuts associated with elimination from major sporting tournaments quickly become extinct.

BBC: Amazing tales from Planet Tabloid