extinction

species in danger of extinction.有灭绝危险的物种

They were hunted almost to extinction..它们遭受猎杀，几近灭绝。

Conservationists are trying to save the whale from extinction..生态环境保护工作者正努力挽救鲸类以防止其灭绝。

extinction ratio,消光比；消减比率

extinction coefficient,消光系数

mass extinction,大量消亡

fire extinction,灭火

arc extinction,消弧，灭弧

light extinction,消光；消光法

extinction angle,消光角