水循環：水從何而來？The Water Cycle: Where does the water come from?

你受到著名天文學家——林超英教授的啟發，想要知道更多關於地球，特別是有關水的科學，從而成為一個天文學家。你想知道水是從哪裡來的，因為水是我們每天必須使用的東西。你的目的是找出水循環的秘密和建議在家裡節省用水的方法。接下來，我們繼續到下一個步驟。

You are inspired by the fabulous work of the famous Hong Kong astronomer, Mr. Lam Chiu-ying. You want to understand more about the earth, especially the water, so as to become an astronomer. You want to know where water comes from as water is something we use every day. You aim at finding out the secret of the water cycle and suggest ways on saving water at home. Let’s continue.

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