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| Our Footprint on Earth | |
| 作者： | Jeanne Sturm |
| 出版社： | Britannica Digital Learning |
| 組合： | Read and Discover Series (Primary)_IV |
| 簡介： | Updated for 2020, Learn about the impact that humans have on the Earth, its environment, and how to reduce damage. |
| 標籤： | 保育, 英文 |
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