But the tremendous expansion of modern civilization now threatens to upset this natural balance, putting unprecedented pressure on the survival of our wildlife.

But the tremendous expansion of modern civilization now threatens to upset this natural balance, putting unprecedented pressure on the survival of our wildlife.

但是现代文明的巨大进步会产生威胁以致打破这种生态平衡，给野生动物的生存带来前所未有的压力。