\( \boldsymbol{x}(u, v) = \begin{pmatrix} a u \\ b v \\ u^{2} + v^{2} \end{pmatrix} \)

\( (- 2 \leq u \leq 2, \, - 2 \leq v \leq 2) \)

\( a = \) , \( b = \) 更新

\( (0.1 \leq a, b \leq 10) \)