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primary navigation
 primary navigation
tech. 沿航线导航
| and
 AND
el. ; 逻辑电路"与"
 and
gen. ; ; ; ;
busin. 以及;
| guidance system
 guidance system
manag. 制导系繞

to phrases
primary navigation
tech. 沿航线导航
primary navigation and guidance system
: 12 phrases in 3 subjects
Aviation7
Electronics4
Space1