deu·te·ri·um /duˈtɪriəm ||dju-/
  重氫;氫的同位素
  deu·te·ri·um /d(j)uˈtɪrɪəm/ 名詞
  氘,重氫
  deuterium
       n : an isotope of hydrogen which has one neutron (as opposed to
           zero neutrons in hydrogen) [syn: heavy hydrogen]
  deuterium
  Symbol: D
  Atomic Weight: 2
  A hydrogen atom which has but one proton and neutron. Deuterium makes up
  about 0.015% of all natural hydrogen. Chemical properties are like that of
  normal hydrogen, though somewhat slower.