In my mind, mankind should keep ecological balance and protect the animals, because they are their friends and it is their duty to take this.
我觉得人类应该保持生态平衡，保护动物，因为动物是他们的朋友，也是他们的责任来承担这一点。
Wetlands are a special ecosystem with various ecological functions and one of the most important environments for the existence of mankind.
湿地是地球上具有多功能的、独特的生态系统，是人类最重要的生存环境之一。
This article reviewed the possible harm of CM food to the health of mankind and ecological environment, discussed the arguments on the safety of CM food in the world.
综述了转基因食品对人类健康及生态环境可能存在的潜在危害，讨论了有关转基因食品的安全性争论。
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