串联过滤器in-line filter
基线basic line
分隔线Line Between
生殖系列germ line(Weismann 1865)germ track
联机保密通信系统on-line secured communications system【通信】
系统分离line isolaion; line separation
无畸变线路distortionless line【电】
釉质生长线incremental line of enamel, Retzius line