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.
氐、羌同源异流，原居西北甘青高原，后分化为两族。
The di and the Qiang peoples inhabiting the northwest Gansu-Qinghai Plateau are consanguineous and divided into two nationalities.
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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