A piece of sod has grass on the top and soil on the bottom.

VOA: special.2009.07.07

We'll shape like a puzzle piece that will allow me to go to the looks palette at top left and it's pretty self-explanatory.

我们将制作出一个拼图,让我去寻找左上角的调色板,它非常明显。

哈佛公开课 - 计算机科学课程节选