scraping

I can't bear the sound of chalk scraping on a blackboard.

我忍受不了粉笔在黑板上的刮擦声。

Elephants and other animals could walk freely without scraping their head on the ceiling -- with plenty of room to spare.

大象和其他动物可以自由走动而不让天花板刮到它们的头部——那里有着充足的备用空间。

Or, like me, you can go back and forth, alternatively scraping off the accumulated gunk and making yourself more accessible by taking on more of it.

或者像我一样，你可以后退或者前进，抑或是刮去那堆堆积物，通过呈现更多使你自己变得更加容易接近。