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1.the survival of the fittest 适者生存
例句：With the changes in the world's climate, dinosaurs died, but many smaller animals lived on. It was the survival of the fittest.
随着世界气候的变迁， 恐龙绝迹了， 但许多较小的动物却继续活了下来。 这就是适者生存。
2.be close to 接近于
例句：The second man was found at lunchtime, believed to be close to where he was working.
在中午时候第二具尸体被发现，靠近在他之前所工作的地点。
3.species of life 物种
例句：Scientists estimate that there could be up to 100 million different species of life on the planet, of which only 2 million have been identified.
据科学家们估计，世界上大约有不小于10亿种不同种类的生物，仅有2亿种为人们所认识。
4.natural selection 自然选择
例句：Accordingly, if natural selection disappears from biology, its offshoots in other fields seem likely to disappear as well.
因此，如果自然选择从生物学中消失，那么在其他分支领域内很可能也会消失。
