这其中起作用的不仅有杜甫个人家庭生活环境变化的因素，更重要的是其苦苦追求的人生理想最终变成了泡影。
The main reason for this change was not only that his family life environment had changed, but that his life ideal had turned out to be disappointing.
他向我们展示了动物是一个大家庭，每一种动物都在慢慢地变化，以适应生活环境。
He showed that animals are all one big family and that every kind of animal changes slowly to match the place where they live.
Geary教授研究了生活在约一百九十万年前到一万年前的我们的祖先以及生活在日益复杂的生活环境中的现代人的头骨尺寸的变化。
He has studied the evolution of skull sizes 1.9 million to 10,000 years old as our ancestors and Cousins lived in an increasingly complex social environment.
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