一个物种一旦灭绝就永远消失了。

A species once extinct is gone forever.

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例如，一个移居的物种可能会因缺乏食物而灭绝。

A translocated species could die out from lack of food, for example.

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目前，越来越多的物种濒临灭绝，这是一个重大的环境问题。

The rampant loss of species occurring today is a major environmental concern.

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一个物种濒临灭绝危险有多种不同的原因。

A species can become endangered for different reasons.

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一个物种临近灭绝时会怎么样？

What happens to a species when its time comes?

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当一个物种的最后一个个体消亡时，该物种就灭绝了。

Extinction of a species occurs when the last individual of that species dies.

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当一个物种的最后一个个体消亡时，该物种就灭绝了。

Extinction of a species occurs when the last individual of that species dies.

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