作例⑥ p. 94 文字が現れては消えていく 複数のアニメーションを使う Over 70 percent of the surface of the earth is covered with water. That is why the earth is called the “water planet.” As you can see on this chart, however, the water available for human use is only about 0.03 percent of the total amount of the earth’s water. More than seven billion people and all other animals and plants must share this limited resource.
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