To analyze ethnic heterogeneity is helpful for us to understand ethnic recognition and the change of ethnic boundary.

分析族群内部异质性有着重要的意义，它有助于我们深入理解族群认同、族群边界的变迁。

youdao

According to the view of circumstantialism, ethnic identity will be changed with situations and caused the shift of ethnic boundary at the same time.

依据族群情境论的观点，族群认同会随情境而改变，同时造成族群边界的移动。

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Original historical memory and social relations had an important place in people's lives. The ethnic boundary was established and adjusted around history and kinship.

原有的历史记忆和社会关系在人们的生活中占据显著位置，族群边界的建立和调整围绕着历史、亲缘关系展开。

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It marked a cultural and ethnic shift as profound as the geographical boundary.

BBC: Following the Silk Road to the end of China

Afghanistan doesn't recognize the so-called Durand Line, the British-drawn boundary between the two countries that cuts through ethnic Pashtun lands, as an international frontier with Pakistan.

WSJ: Afghans Protest After Clash on Pakistani Border