名词
中文翻译：Unknown
同义词：
['sub-note', 'supplementary note']
例句：
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1.In the margin of the book, there is a side note explaining the historical context of the story.
书的边上有一段附加说明，解释了故事的历史背景。
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2.The teacher added a side note to the test paper to provide additional information.
老师在试卷上加了一段附加信息。
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3. The author included a side note in the introduction to explain the significance of the work.
作者在引言中加入了一段附加说明，解释了作品的重要性。