Ecology is a branch of science that studies the relation between human and the environment.
生态学是一门研究人类与其环境之间关系的科学。
The relation of human and nature is an old subject. Because natural ecology is destroyed and life environment is worsened, it becomes hot spot in recent years.
人和自然的关系这个古老的课题，因近年来自然生态的破坏和人类生存环境的恶化，再次成为热点。
It is urban ecology that studies the relationship between citizen and environment which is characteristic of high intense human activities.
城市生态学正是研究这种以人类密集活动为特征的城市居民及其栖息环境关系的科学。
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