短語詞組短語best uniform rational approximation 最佳一致有理逼近weierstrass uniform approximation theorem weierstrass 一致逼近定理uniform approximation theory 一致逼近原理best uniform approximation 最佳一致逼近uniform approximation detail 平均近似值uniform fielsd reginal approximation 平均場區(qū)域近似optimal uniform approximation 最佳一致逼近simultaneous uniform approximation 同時一致逼近the best uniform approximation 最佳一致逼近元 返回 uniform approximation