zero gn.无重量zeron.零；零度；最低点；完全没有；无足轻重的人或物adj.零的；无价值的；零视度的v.把 ... 调零；瞄准；集中注意；迫近Zero assumption零假设zero graduation零分划,零位刻度zero boil-off无损储存Zero Lift Chord零升力弦zero for a loss输局得0分zero-entrance零入zero refraction零折射zero-inflated零过多zero background零背景zero gain relay零增益继电器