A line used as both sterile and maintaining line
agonic line {agonic line of no declination}
Dual purpose line with nucleic male sterile line
Fault Cutoff Line Allan Line
Male sterility line and maintainer line
velocity line of arc line short band
contribution quota method of invisible assets
energy-saving block and invisible multi-ribbed fra
energy-saving block walls with invisible multi-rib
invisible
隐形
无形
不
看
贸易
隐
不可见的
无形说
无形
非贸易的
看不见的
无形的
帐外的
未列帐的
不易见的
透明性
不可感知性
低可见性
看不见
Invisible bracketless appliance
Invisible bracketless technique