气动高真空蝶阀:hit the ceiling

hit the ceiling hit the floor 伴奏 hit the book是什么意思 hit the floor hit the headlines怎么翻译？ he hit the boy ____face. hit the floor什么意思 怎么翻译：no raising of eyes to the ceiling no raising of eyes to the ceiling什么意思？ Optimal evenness of the slab underside by simple adjustment from top of the ceiling elements.