( immune systems)
Your immune system consists of all the organs and processes in your body which protect you from illness and infection.
N-COUNT : usu sing
( immune systems)
Your immune system consists of all the organs and processes in your body which protect you from illness and infection.
N-COUNT : usu sing
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006