在创建一个新的字符串时，我们分配一块动态的缓冲区来保存它所包含的文本。

For a new string we allocate a dynamic buffer to hold the text.

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单元体可以认为是已经分配出去的内存区。

The body of the cell is the area of memory which is considered allocated.

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单元体可以认为是已经分配出去的内存区。

The body of the cell is the area of memory which is considered allocated.

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