标志确定RSpec执行代码块的频率。
The symbol determines how often RSpec should execute the code block.
每发现一个匹配对象，就会执行一个动作(代码块)。
Everywhere a match can be found, an action (code block) can be executed.
通常，awk会针对每个输入行执行一次每个代码块。
Normally, awk executes each block of your script's code once for each input line.
第二个代码块使用的是 Iterator，应该比第一块执行得快一些。
The second block, which uses an Iterator instead, should perform faster than the first.
不管代码是否执行该块，这些初始化都会生效。
These initializations take effect whether or not your code ever executes the block.
不管代码是否执行该块，这些初始化都会生效。
These initializations take effect whether or not your code ever executes the block.
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