zero

零, 零点, 零度, 无, 乌有, 最低点

a mathematical element that when added to another number yields the same number; the point on a scale from which positive or negative numerical quantities can be measured; the sight setting that will cause a projectile to hit the center of the target with no wind blowing

零的, 没有的

调零, 对(炮火等)作协调校正

adjust (an instrument or device) to zero value