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ряд актиния stresses
el.	actinium family
tech.	actinium series
радиоакт.	actinium radioactive series; 4n + 3 series; uranium-actinium radioactive series; uranium-actinium series; actinium radioactive family; radioactive family of actinium; 4n + 3 family; uranium-actinium family; uranium-actinium radioactive family; radioactive family of uranium-actinium

ряд актиния: 3 phrases in 2 subjects

Electronics	2
Physics	1