The modern atmosphere supports many forms of complex life that would not have been able to exist in Earth's first atmosphere because the oxygen level was too low.
现代大气层支持着许多复杂的生命形式，而这些生命在地球最初的大气层中是不可能存在的，因为当时的氧气含量太低。
Nevertheless, low and simple forms will long endure if well fitted for their simple conditions of life.
不过，低等的、简单的生物，如果和它们的简单的生活条件密切适合，却也可以在长时期内保持不变。
In this paper the authors presented a comparative study on shade-tolerance of low subtropical plants of different life forms, to provide experimental data in the selection for urban greenery.
该文研究了南亚热带不同生活型植物的耐阴性，为城市绿化植物选择配置提供实验依据。
应用推荐