But not all animals here are stuck in one place. 但这里的动物并非全都困于一地
One byproduct of photosynthesis is a gas, 光合作用的副产品之一是一种气体
that plankton will one day give rise to every single plant on Earth. 以至于有朝一日 地球上一切植物都将由其催生而出
one of the few sounds in this otherwise silent realm. 是那个原本寂静的世界中 为数不多的声音之一
A period which allowed one group to become the mightiest of dynasties. 这个时期 令一个物种群建立了最强大的王朝
Throughout history, volcanoes have been one of the greatest agents of change. 纵观历史 火山一直是最大的变化因素之一
was one reason terror birds went extinct. 是骇鸟灭绝的原因之一