名詞 gray matter:

1. greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
   同義詞：grey matter, grey substance, gray substance, substantia grisea

1. A group of specialized nerve cells or a localized mass of gray matter in the brain or spinal cord.
   神經(jīng)核一組專門的神經(jīng)細胞或存在于大腦或脊髓中灰物質的局部塊