When plotting two or more curves, we need a key or legend to distinguish them.
当绘制两条或多条曲线时，我们需要关键字或图例来对它们进行区分。
By looking at the legend (or key), you should be able to tell which line in the graph is which.
通过查看图例(或键)，您应该能够知道图中的线分别是何种曲线。
The design of form and legend is the basic and necessary work to map-making for every special theme, also the key of standardization and automation for karst hydrogeology maps.
图式图例的设计是每项专题制图工作必不可少的基础工作，也为制图工作实现标准化、自动化的重要环节。
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