They used a kind of triangulargraph paper to plot the three measurements against one another.
他们用一种三角形的坐标纸把三个测量值画在一起。
2
All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangulargraph.
所有陆龟品种都在三角形的上部形成一个紧密的点群；所有的水龟都聚集在三角图的下方。
3
Sure enough, these amphibious species show up on the triangulargraph approximately half way between the "wet cluster" of sea turtles and the "dry cluster" of land tortoises.