(noun.) the sight setting that will cause a projectile to hit the center of the target with no wind blowing.
(noun.) the point on a scale from which positive or negative numerical quantities can be measured.
(noun.) a mathematical element that when added to another number yields the same number.
(verb.) adjust (as by firing under test conditions) the zero of (a gun); 'He zeroed in his rifle at 200 yards'.
(verb.) adjust (an instrument or device) to zero value.
(adj.) indicating the absence of any or all units under consideration; 'a zero score' .
(adj.) indicating an initial point or origin .
(adj.) of or relating to the null set (a set with no members) .
(adj.) having no measurable or otherwise determinable value; 'the goal is zero population growth' .
手打:谢莉
校对:奥利弗