An executable unit begins at the start of every basic block and at any instruction that corresponds to a line of source code that is different than the previous instruction.
一个可执行的单元由每一个基本快开始，而与每行源代码相对应的指南与前面版本中的指南有所不同。
By the way, that's a comment on the first line (with the name of the source file for the code example).
顺便说一下，在第一行有一句注释(在代码例子中是源文件的名字)。
The best source of ideas and code comes from experienced practitioners of the command line.
最有效的得到思想和代码的途径就是咨询那些在命令行方面具有丰富经验的行家。
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