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твърдост n
phys.	keménység; szilárdság
твърдост Съпротивление на едно твърдо тяло срещу проникване, надраскване, абразия или срязване form.
environ.	keménység

твърдост: 5 phrases in 3 subjects

Environment	1
Hydrology	1
Metallurgy	3