also half life
( half-lives)
The half-life of a radioactive substance is the amount of time that it takes to lose half its radioactivity.
N-COUNT
also half life
( half-lives)
The half-life of a radioactive substance is the amount of time that it takes to lose half its radioactivity.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006