Those characters that do not map will be substituted by a reserved code point.
那些没有映射的字符将通过预留的代码点来代替。
Every code page has reserved at least one code point for substitution.
每一个代码页至少预留了一个代码点，以便进行替代。
There are two more reserved planes plane 15 and plane 16 , for private use , where no code point is assigned.
还有两个保留平面，平面15和平面16 ，用于个别用途，没有分配编码指针。
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