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Sua. look at this paper cup. Ok, I¡¯ll show you magic!
If you want to spin it, what do you need?
Wind! Yes, good job, and what else?
Ok, look carefully. The water is boiling and steaming.
Hold this cup and put(?) it close to the spout.
What happen? Yes, the cup is spinning. So fast! Cool!
What do you think spins the cup? Can you guess?
Yes, steam! The steam is spinning the cup. Steam is so powerful and even stronger than you think. Nowadays train runs on electricity, but bygone days people set train in steam. you saw the steam engine in the book. Didn¡¯t you?