3).未初始化的数据段（Uninitialized data segment），经常被称为“bss”段，在代表“block started by symbol”的古老的汇编操作之后命令。
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这些符号可以用来对各种代码段和数据段进行命名，包括经过初始化的和未初始化的。
The symbols are used for naming various sections of code and data, both initialized and uninitialized.
题外话，在堆和栈的顶端，还有好几层，但是在技术段之下，他们被叫做初始化数据和未初始化数据。
Now, as an aside, there's another couple of layers at the very top above the stack and above the heap, but below the tech segment and those are called initialized data and uninitialized data.
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