Our natural resources are limited and we need to learn how to preserve our world.
自然资源极其有限，我们需要学会如何保护这个世界。
Firstly, our natural resources and energy are limited; therefore, it is absolutely necessary for us to save and protect them.
首先，我们的天然资源和能源是有限的，因此，我们是绝对必要的拯救和保护它们。
Firstly, our natural resources and energy are limited; therefore, it is absolutely necessary for us to save and protect them.
首先，我们的天然资源和能源是有限的，因此，我们是绝对必要的拯救和保护它们。
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