我个人的理解:
1.
chart:柱状图,饼图,这种图表会用chart.
2.
diagram:图解,那种示意图会用diagram.
3.
graph:图形
4.
figure:人或物的外部形状，看起来象某个形状的事物（事物的外部形状）
Diagram is drawn by ideas or concept. Chart is drawn by numbers. Figure can be either one or combination of both.
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