chart

: information in the form of a table, diagram, etc.

可以看出chart強調的主要是圖表中的【資訊】。

di·a·gram

1: a graphic design that explains rather than represents;especially: a drawing that shows arrangement and relations (as of parts)

2: a line drawing made for mathematical or scientific purposes

可以看出diagram強調的是一個用來解釋某件事情或者在數學或科學上用來表示某物的影象。

graph

1: the collection of all points whose coordinates satisfy a given relation (as a function)

2: a diagram (as a series of one or more points, lines, line segments, curves, or areas) thatrepresents the variation of a variable in comparison with that of one or more other variables

3: a collection of vertices and edges that join pairs of vertices

graph則表示很多點連線起來的影象，是用來表示、代表一個變數隨另一個變數的變化。

fig·ure

a : the graphic representation of a form especially of a person or geometric entity

figure的意思特別多，和影象有聯絡的主要是以上的釋義，which說明figure主要是用影象來表示一個表格。