可延拓成N类函数的极值问题
Extremal Problems for Some Functions to be Extended into Class N
指出了圆环上可向内可延拓成N类函数的延拓并不唯一；
Point out that inner extension is not unique ;
它们沿着湖湾的边缘延，伸成无穷无尽的一行：
They stretched in never ending line . Along the margin of a bay ;
延成