有俄罗斯族裔，加上肤色较深的土耳其人和波斯人，但是最常见的是椭圆形脸，带有蒙古族特点，他们的祖先是成吉思汗。

There were ethnic Russian, plus darker skinned Turks and Persians; but most common were the oval, Mongolian features of the ancestors of Genghis Khan.

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通过建立合适的双基坐标系，得出双基雷达的等距离和曲线方程是一族椭圆。

By establishing proper bistatic coordinates, a conclusion is obtained that equidistance curves of bistatic radar are a series of ellipses.

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