autonomic nervous system
noun [ C usually singular ] biology specialized uk/ˌɔː.tə.nɒm.ɪk ˈnɜː.vəs ˌsɪs.təm/ us/ˌɑː.t̬ə.nɑː.mɪk ˈnɝː.vəs ˌsɪs.təm/
自主神经系统
the part of the nervous system that controls automatic processes such as breathing, digestion, and the beating of the heart