After a recent Monday-evening class, five-year-old Zang Siqi rushes toward her mother, eager to show off a white rocket she has made out of paper, a Snow White sticker in its nose cone.

最近一个周一的晚班课程结束后，5岁的臧思琪（音）冲向她的妈妈，急不可待地让她看自己用纸叠的一枚白色火箭，火箭头锥部分贴着白雪公主的贴纸。

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Feng Siqi, Do you know today is a special day?

冯思琪，你知道今天是个什么特别的日子吗？

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I have a good friend, her name is Wang Siqi. She is very lovely.

我有一个非常好的朋友，她名字叫汪思琪，她非常活泼可爱。

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But Zheng Siqi of Beijing's Tsinghua University worries whether the building boom is sustainable.

ECONOMIST: Giving the urban poor a place to call home