水永无休止地在海洋、空气和陆地之间这样循环运动。
Water moves endlessly among sea, air and land in this circulation .
他知道他们将会需要空气，水，陆地，和食物。
He knew they would need air to breathe, and water, and land, and food.
地球是我们的家园，我们必须保持陆地、空气和水的干净。
The earth is our home. We must keep the land, air and water clean.
因为人们污染空气、水和陆地。
因为人们污染空气、水和陆地。
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