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。
We should call on people to protect animals.
我们应该号召人们保护动物。
For those reasons, people should protect the environment first if they want to protect wild animals effectively.
因为这些原因，人们要有效保护野生动物得先从保护大自然开始。
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