标志确定RSpec执行代码块的频率。

The symbol determines how often RSpec should execute the code block.

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首先，将执行代码块中最接近的匹配结果。

The first, closest match results in said code block being executed. So, for example, in Scala you could have.

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在粗糙的层次上，您通常只想在开始或结束执行代码块时自动调用不太特定的规则。

At a rough level, you usually just want to automatically call a less specific rule at either the start or the end of execution of a code block.

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