Common assembly level constructs such as variables, loops, labels, and macros.

常用的汇编级结构，比如变量、循环、标签和宏。

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The problem with non-hygienic macros is that the introduced variables can overwrite and be overwritten by other variables in the code.

非健康宏的问题是，引入的变量和代码中的其他变量可能相互覆盖。

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Table 5-1. Functions, macros, variables, and data structures related to system.

表5 - 1是本章所涉及到的一些函数，宏，变量以及数据结构。

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