资料来源 : pyDict

射击近於负脉冲信号

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Undershoot \Un`der*shoot"\, v. t.
   To shoot short of (a mark).

资料来源 : WordNet®

undershoot
     v 1: fall short of (the runway) in a landing; "The plane
          undershot the runway"
     2: shoot short of or below (a target) [ant: {overshoot}]
     [also: {undershot}]