单词	track ball
释义	track ball 跟踪球
随便看	beam rider radar beam rider system beam-rider trajectory beam rider type beam-riding beam -riding beam riding beam-riding guidance system beam-riding missile beam riding missile beam-riding missile guidance beam-riding system beam rigidity beam rolling mill beam-rolling mill beam rotation beam roughing method beam rug beam runner beams beam sagging beam saltus beams and columns beam satellite antenna beam scale 墸墹墺墺4 墻墼墽墾墿壀ねんりょねんりょ【念慮】ねんりょうねんりょう【燃料】ねんりょうでんちねんりょうでんち【燃料電池】ねんりんねんりん【年輪】ねんれいねんれい【年齢】