许多英国人可能将更关注自己经受的苦难，而忘却了几乎被灭绝的犹太人。

Many British people might focus more on their own suffering than that of the all-but vanished Jewish population.

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边界粘土层被科学家用来确定一个灭绝物种衰落的速度。

Boundary clay layers are used by scientists to determine the rate at which an extinct species declined.

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美国本土语言在欧洲殖民以前就已经存在了，现在美国已经丢失了超过三分之一的本土语言。剩下的192种语言被联合国教科文组织列为介于“不安全”和“灭绝”之间。

The US has already lost more than a third of the native languages that existed before European colonization, and the remaining 192 are classed by UNESCO as ranging between "unsafe" and "extinct".

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