Someone who hits the ceiling -- the top of the room -- is violently angry. A wife may hit the ceiling because her husband forgot their wedding anniversary.
Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future
The doors go up and then flop over in a constrained enough way that the Model X won't rub up against a car parked close to it or hit the ceiling in a garage.
车门升起,然后以足够受限的方式翻滚,以至于 Model X 不会与停在附近的汽车摩擦或车库的天花板。
Harry was too quick for Neville, whose wand went spinning out of his hand, hit the ceiling in a shower of sparks and landed with a clatter on top of a bookshelf, from which Harry retrieved it with a Summoning Charm.