极限jí xiàn
limit, extreme boundary椭圆tuǒ yuán
oval, ellipse, elliptic正负zhèng fù
positive and negative比重bǐ zhòng
proportion, specific gravity相等xiāng děng
equal, equally, equivalent立体lì tǐ
three-dimensional, solid, stereoscopic算数suàn shù
to count numbers, to keep to one's word精密jīng mì
accuracy, exact, precise, refined误差wù chā
difference, error, inaccuracy运算yùn suàn
(mathematical) operation