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primary guidance
 primary guidance
space 起始 段制导
| navigation
 navigation
comp., net. 漫游
environ. 导航
hydroel.st. 航行; 航运
interntl.trade. 航船; 领航
navig. 航海; 导航
| and
 and
gen.
| control system
 control system
hydroel.st. 控制系统

to phrases
primary guidance
space 起始[主动]段制导
primary guidance, navigation and control system
: 9 phrases in 3 subjects
Aviation3
Electronics4
Space2