n. a mathematical element that when added to another number yields the same number
n. the point on a scale from which positive or negative numerical quantities can be measured
n. the sight setting that will cause a projectile to hit the center of the target with no wind blowing
v. adjust (an instrument or device) to zero value
n. 零, 零点, 零度, 无, 乌有, 最低点
a. 零的, 没有的
vt. 调零, 对(炮火等)作协调校正
[计] 零