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火球 huǒqiú
gen.	bolide; flashing
oil	fireball
slang	fire ball
space	fireball (核爆炸的)
核弹火球 huǒqiú
space	ball of fire

火球: 128 phrases in 23 subjects

Agriculture	2
Air defense	1
Animal husbandry	1
Astronautics	2
Automobiles	1
Aviation	6
Chemistry	1
Desert science	5
Earth sciences	11
Electric machinery	1
Electronics	2
General	11
Geology	1
Latin	5
Metallurgy	9
Nautical	2
Oil / petroleum	2
Sailing ships	1
Shipbuilding	2
Space	29
Steel production	1
Technology	31
United States	1