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一次空气 yīcì kōngqì
met.	main combustion air; primary air
tech.	fresh air; underfire air
一次空气在参与燃烧的空气中，最初接触燃料，进行氧化反应的空气，称为一次空气 yīcì kōngqì
ecol.	primary air

一次空气: 5 phrases in 3 subjects

Metallurgy	2
Refrigeration	1
Technology	2