代表キーワード :: 水資源

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  • Earth, the Water Planet
  • The earth is called a water planet because more than 70% of its surface is water. About a 1.4 billion cubic kilometers of water cover the earth. People live their lives enjoying the benefits of water while having to fight with water from time to time. We use w...
  • 550 販売中 2006/02/15
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