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你知道世界上有多少种语言吗？
Do you know how many languages there are in the world?
youdao
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没有人知道世界上有多少种语言。
Nobody knows how many different languages there are in the world.
youdao
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没有人知道世界上有多少种语言。
Nobody knows how many different languages there are in the world.
youdao