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twardy adj.
construct.	dur; rigide

twardy: 64 phrases in 14 subjects

Building materials	1
Chemistry	10
Construction	23
Earth sciences	4
Economy	2
Electrochemistry	1
Electronics	2
Forestry	1
Law	3
Lighting other than cinema	1
Magnetics	1
Metallurgy	2
Microsoft	12
Welding	1