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magnetic compass
avia.	磁针罗盘
dril.	罗盘
eng.geol.	罗盘仪
met.	磁针罗盘
skydive.	磁罗盘
space	磁罗经
tech.	罗盘 (仪); 罗经; 磁罗盘 (仪); 磁经

magnetic compass: 34 phrases in 5 subjects

Aviation	4
Oil / petroleum	1
Shipbuilding	12
Space	2
Technology	15