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The relay race

接力賽

Hello. You look tired today.

你好。你今天顯得有點兒累。

Oh ,dear! she said.

“天哪！”她說。

I know! smiled Lucy. They have steps, and they begin with L!

“我知道！”露茜笑著說，“它們有階梯，并且這個單詞是以L開頭的！”

But of course, he can learn by himself. He has a book and a dictionary.

但當然，他也可以自學。他有書和詞典。

What's it used for?

有什么用途？