科研之友
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摘要
<正>In the sky, you can see the sun, stars, and the moon.The sun is up during the day. It is very hot. The sun gives us light and heat. Plants need the sunlight to grow.We can see the stars at night. They give off(发出) light and heat, like the sun. That is because the sun is a star, too! There are more stars than we can count.
