It is called the continuous extension function which in some spot makes the continuously extension, the continuous extension function plays important affects in the relevant questions of function.

连续开拓是函数连续性中的重要概念，对函数在某点做的连续开拓所得到的函数称为连续开拓函数，连续开拓函数在函数的有关问题证明中起重要作用。

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It is called the continuous extension function which in some spot makes the continuously extension, the continuous extension function plays important affects in the relevant questions of function.

连续开拓是函数连续性中的重要概念，对函数在某点做的连续开拓所得到的函数称为连续开拓函数，连续开拓函数在函数的有关问题证明中起重要作用。

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