径迹长度

track on

germ line(Weismann 1865)germ track

endless TRACK(S) for exercising athletes

crosstalk【计】;inter track crosstalk【计】;interchannel crosstalk【通信】

fast-track procedure

metal track【车辆】

endless-track automobile

main track【计】;major track【计】[专业]录音或录像\nmother track【电子】