民族民间文化的人为破坏和自然灭绝，唤醒了人类的保护意识。
Human's destruction and naturalextinction in national folk culture awakened people's preservative awareness.
这是加上自然灭绝速度的现有遗传冠军和近废除遗传因素的上议院在二十世纪末。
This was coupled with the natural rate of extinction of existing hereditary titles and the near abolition of the hereditary element of the House of Lords at the end of the twentieth century.
正常条件下的物种自然灭绝我们可以置之不理，但由于人类活动造成的物种灭绝我们就必须加以控制。
We can ignore the natural extinction of species under the normal conditions, but we must controll the extinction of species that caused by human activities.
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