维基百科：氦 English 4He English binding energy of a Helium nucleus Hélio English Hélio English English Helium-4 4He English English English Helium-4 Hélio English helium-4 English Helium-4 English English helium-4 English helium-4 English English Hélio helium-4 atom Hélio helium-4 Hélio English Hélio English Hélio English English English helium-4 English Helium-4 English Helium-4 helium-4 4He wikipedia.org 4He Helium-4 helium-4 helium-4 helium-4 English 4He Helium-4 English Helium-4 Hélio Hélio http://en.wikipedia.org/wiki/Helium-4 helium-4 Hélio Helium-4 English English Hélio English Hélio-4 English Hélio English English 维基百科：氦 English Helium-4 English 4He English English