通常指消灭一个种族、家族、物种或生长物，通常指环境的变更使其生长率远小于死亡率，最终趋于消失。
树袋熊已列为澳大利亚濒临绝种的动物之一。
对绝种的生命形式进行克隆的想法仍然属于科学幻想。
The idea of cloning extinct life forms still belongs to science fiction.
按照目前的下降速度，许多雨林动物不到十年就会绝种。
At the current rate of decline, many of the rain forest animals could become extinct in less than 10 years.
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