每一个找到的要展开的宏都会在跟踪输出中增加一级缩入。
Every found macro to expand will add an additional indentation level inside the trace output.
内文及标题排字的一种格式。第一行全长顶格，以后各行缩入一固定距离。
Style for body and headline composition in which the first line is set full measure and all succeeding lines are indented an identical distance at the left.
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