Protective effects of brain-derived neurotrophic factor gene-modified human umbilical cord blood stem cells on spinal cord injury following transplantation是什么意思_Protective effects of brain-derived neurotrophic factor gene-modified human umbilical cord blood stem cells on spinal cord injury following transplantation在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句