风力涡轮机如何工作？
风力涡轮机利用风能并将其转化为电能。其中使用了浮力的物理原理。 创作者：ZDF/Pur+/Autorenkombinat/Tobias Schönke/Rita Gerhardus-Faust/Jochen Schmidt 文本翻译：alugha 点击这里观看更多视频：https://alugha.com/TerraX
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Formation of the Baltic Sea
20,000 years ago, the Baltic Sea region was still covered by a glacier. A change in climate caused the glacial ice to melt. The first form of the Baltic Sea emerged: a freshwater lake. Today, despite its connection to the North Sea, it is considered an inland sea. Author: ZDF/Terra X/Nina Zorn/Anna
