Many animals and plants are in danger because of dying out.
许多动植物由于灭绝而处于危险之中。
Prior to the substantial changes occurred in society, that far too little had been done to prevent animals and plants from dying out was virtually unheard of.
在社会发生重大变革之前，人们在保护动植物灭绝方面没有作出任何努力的问题几乎没有听说过。
Prior to the substantial changes occurred in society, that far too little had been done to prevent animals and plants from dying out was virtually unheard of.
在社会发生重大变革之前，人们在保护动植物灭绝方面没有作出任何努力的问题几乎没有听说过。
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