垫: Ⅰ动词1.(用东西支、铺或衬, 使加高、加厚或平正) put sth. under sth. else to raise it or make it level; fill up; pad 短语和例子垫路 repair a road by filling the holes; 桌子腿底下垫点纸就平了。 put a wad of paper under the leg of
真空: [物理学] vacuum; empty space; vacuo 短语和例子高真空 fine [high; perfect] vacuum; 极高真空 extreme high vacuum; 未尽真空 partial vacuum; 产生真空 produce a vacuum; 制造一个权力真空状态 create a power vacuum; 真空包装 vacuumiz
