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平背 píngbèi
book.bind.	flat spine

平背: 70 phrases in 21 subjects

Acrobatics	2
Air defense	1
Animal husbandry	1
Architecture	1
Automobiles	4
Chemistry	1
Dancing	1
Desert science	3
Drilling	2
Electronics	1
General	3
Gymnastics	1
Ichthyology	1
Latin	1
Metallurgy	1
Oil / petroleum	7
Polygraphy	1
Refrigeration	1
Skydiving	1
Technology	15
Textile industry	21