1. The society was set up to preserve endangered species from extinction. �������Э����Ϊ�˱�����Σ���ֲ��������
2. If Australians could cooperate to save this special species, mankind should be able to prevent the extinction of all other animals, too. ��������˿���ͨ���������������ر�Ķ����ô����ҲӦ���ܹ������������������������
3. Deforestation endangers many animals, and mankinds great thirst for water and other resources leads to the extinction of many plant forms. ����ɭ��Σ�����ද��������ˮ��������Դ�����������������ֲ����֡�
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n.
1. no longer in existence
2. no longer active; extinguished
3. the reduction of the intensity of radiation as a consequence of absorption and radiation
4. complete annihilation
5. a conditioning process in which the reinforcer is removed and a conditioned response becomes indepen
6. the act of extinguishing; causing to stop burning
�ɿ�Ӣ�� - 划词释义
