第四章是论文的重点内容，就财务危机预警模式、主体构架、经济变量含义和实际应用进行详细介绍。
The fourth chapter is the core content, expounding the financial crisis early-warning mode, the main frame, the meaning of economic variables and how to use it for the listed companies.
$_ 是另一个在不同上下文中有不同含义的特殊变量。
The $_ is another special variable that has different meanings in different contexts.
因为该页面在多处重用这个值，我发现用一个含义明确的变量来存储会更方便。
Because this page reuses that value in several places, I find it more convenient to store it a descriptively named variable.
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