1. The teacher is explaining the theory of evolution to the students.
    老师正在给学生们解释进化论。

2. Darwin´s points about slow evolution
    达尔文的逐渐进化的观点

3. It is not a simple competition for a fixed amount of food determined by the physical environment, because the environment that determines our evolution is no longer essentially physical.
    它已不是为争得物质环境所决定的东西所决定。

4. In terms of the evolution of life on Earth, human beings have just arrived.
    就地球上生命的进化而言，人类是姗姗来迟者。