第十七课：我肚子疼得厉害。

Lesson 17: My stomach aches very badly.

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第十七课为什么软件不应当有所有者？

Lesson 17 Why software should not have owners?

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第十七课你想喝点什么？

Lesson 17: What would you like to drink?

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第十七单元笑第一课什么这样好笑？

Unit 17 Laughter Lesson 1 What's so Funny?

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第十七单元笑第一课什么这样好笑？

Unit 17 Laughter Lesson 1 What's so Funny?

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