They're evenly spaced in this model.

　　它們均等地分隔在這個模型中。

　　Because the levels are all evenly spaced.

　　因為所有的等級是等間距的。

　　That's why the contours are evenly spaced.

　　那就是為什么等高線圖是均勻間隔線的排列的。