介绍了分离两族条纹的旋光光路。

The rotation optical path for separating two families of fringes is introduced.

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英国最早的印欧人分为两族：苏格兰人和凯尔特人。

The earliest known of these British Indo-Europeans split into two groups called the Scots and the Celts.

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在这一研究的第二部分，在两族之间有一些治疗前差异。

In the second part of the study there were some pre-treatment differences between the two groups.

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