人们称之为轮子上的房子。

People call them houses on wheels.

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人们称之为友谊书。

People called it a friendship book.

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这就是为什么人们称之为北极光。

That's why they're called the Northern Lights.

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But in the course of history, we settled beginning in the sixteenth and seventeenth century, down into just two patterns: what we call the major pattern and the minor pattern.

但在历史的发展过程中,在十六到十七世纪期间,人们最终确定了下列两种模式,我们称之为大调模式和小调模式

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