( central nervous systems)
Your central nervous system is the part of your nervous system that consists of the brain and spinal cord.
N-COUNT
( central nervous systems)
Your central nervous system is the part of your nervous system that consists of the brain and spinal cord.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006