1. The society was set up to preserve endangered species from extinction. 成立这个协会是为了保护濒危物种不致灭绝。
2. If Australians could cooperate to save this special species, mankind should be able to prevent the extinction of all other animals, too. 如果澳洲人可以通力合作拯救这种特别的动物，那么人类也应该能够避免所有其他动物的灭亡。
3. Deforestation endangers many animals, and mankinds great thirst for water and other resources leads to the extinction of many plant forms. 砍伐森林危及许多动物，而人类对水和其他资源的需求极大，因而导致许多植物绝种。
英英解释
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 no longer active; extinguished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
