nonblackn.非黑人nonadv.[拉]非；不是non-small-cell lung/SU非小细胞肺／外科学Non - constant gradual flow非恒定渐变流Nonconforming finite elements非协调元non-material cultural rehcs非物质文化遗产nonnucleated dwarf elliptical无核矮椭圆星系nonmagnetic mass spectrometer非磁质谱计non-tissue specific antigen非组织特异性抗原non-project type assistance非计划型援助non-point pollution sources非点源污染non-imprisonment punishment非监禁刑

1. We conducted a systematic review of randomized trials comparing lumbar fusion surgery to nonsurgical treatment of chronic back pain associated with lumbar disc degeneration.
   对于比较腰椎融合术和非手术疗法治疗腰椎间盘退变相关的慢性腰痛的随机试验，我们进行了一项系统性的评价。