If the Earth's magnetic pole reversal caused by biological extinction, it is not difficult to explain why from time to time, so that the periodic destruction of the Earth civilization.
假如地球磁极逆转而造成生物大量灭尽，那就不难表明为何每隔一段时间，使地球文明周期性的毁灭。
The extinction of myriad biological species aroused deep concern which led people to an understanding of the special importance of protecting rare animals and plants on the brink of extinction.
无数生物物种的灭绝引起了人们的深切关注，使人们认识到保护濒临灭绝的珍稀动植物的特殊重要性。
Before the existence of human, the process of biological evolution is accompanied with species extinction.
人类出现之前，生物进化的过程中就伴随着物种的灭绝。
Since life appeared on earth, biological species grew dynamically. However, the speed of species extinction is gradually accelerating as human being came to dominance.
地球出现生命以来，生物物种数量动态增长，但随着人类活动的出现，生物物种灭绝速度逐渐加快。
Since life appeared on earth, biological species grew dynamically. However, the speed of species extinction is gradually accelerating as human being came to dominance.
地球出现生命以来，生物物种数量动态增长，但随着人类活动的出现，生物物种灭绝速度逐渐加快。
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