避免大篇幅的连续文本，把他们分解成多个小的章节。
Avoid large blocks of text. Break them into smaller paragraphs.
行距是两个连续文本行的基线之间的垂直距离。
The line spacing is the vertical distance between the base lines of two consecutive lines of text.
检索与当前文本选择(或多个文本选择)关联的不连续文本范围的集合。
Retrieves a collection of disjoint text ranges associated with the current text selection or selections.
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