可改善

A member of the Siouan people of the N Mississippi valley; commonly called the Sioux.

生活在北密西西比流域的苏族人；一般叫做苏族人。

And做上, middle and lower and inner, middle and outer parts of the bisector, a line of three and three vertical lines.

然后做上、中、下和内、中、外各部分的平分线，得三条横线和三条纵线。