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。
If we want to keep the ecological balance, will try to avoid soil erosion.
如果我们要保持生态平衡，就要尽力避免水土流失。
In order to keep the ecological balance, people should protect animals.
为了保持生态平衡，人们应该保护动物。
In order to keep the ecological balance, people should protect animals.
为了保持生态平衡，人们应该保护动物。
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