Once we get the general area of our clouds, we want to drop the brush opacity to 20% and start slowly painting away our detailed areas.

一旦我们得到了云彩的大概区域，要将画笔不透明度调为20%，然后开始慢慢地擦除区域中不需要的细节。

youdao

Natural use materials that contrast the color and/or texture of the signaling area (rocks, brush, branches, stomped grass).

信号区域中颜色、纹理差异较大的材料（岩石，树林，树枝，践踏过的草地等）

youdao

When it's active, use a brush to paint outside the selected area to get this cool effect.

当三角选区激活时，用笔刷在选区外涂抹，以达到这样的酷炫效果。

youdao

In Northern California, a fire in a remote area of brush and timber north of the town of Butte Meadows grew to more than 3 square miles, with 10 percent containment, state fire spokesman Daniel Berlant said.

NPR: Fire Forces Evacuation Of Campus, Homes In Calif.

Video from CNN affiliate WBOC showed smoke rising from brush fires in the unpopulated area.

CNN: Navy drone crashes in Maryland

That set off a frenetic search through an area marked by dense brush and steep terrain.

CNN: See daring rescue of hiker