她用铅笔在素描上添加了一些阴影，使画面更有立体感。

She added some ___shading with a pencil to make the sketch look more three-dimensional.

这幅画中天空的色调有着细腻的层次变化。

The sky in this painting has delicate ___shadings of blue.

窗帘有效地阻挡了强烈的阳光。

The curtains provide good ___shading against the harsh sunlight.