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двухкилевое оперение stresses
astronaut.	twin fins; double vertical surface
avia.	twin vertical tails; twin-tail surfaces; double fin; double fins
tech.	twin-fin empennage; twin-fin tail unit; twin-fin tail

двухкилевое оперение: 12 phrases in 3 subjects

Astronautics	5
Aviation	5
Technology	2