label the graphs rather than using a key.
Although the use of colour is fine, data in graphs must be distinguishable in black on white, which is the format of the hard copy of the Journal. In Figures 2 & 3, label the graphs rather than using a key.
请问各位高人，最后一句label the graphs rather than using a key.是什么意思？我在orgin图中用的是直线
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最好上图后，根据实际情况才知道如何解决，否则很难懂key啥意思。
就是这个图
Fig. 2.jpg
，