凡例
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Meanings
1
explanatory notes; introductory remarks; usage guide
Refers to the section at the beginning of a book, dictionary, or manual that explains conventions, symbols, abbreviations, and how to use the work.
If you read the dictionary's explanatory notes, you'll understand what the symbols mean.
2
Used for the explanatory key on maps, charts, diagrams, and drawings that defines symbols, colors, and patterns.
See also: キャプション
I looked at the map legend and saw that this line indicates a highway.