Their faces were blackened with soot.他们满脸煤灰。Soot is the product of the imperfect combustion of fuel.煤烟是燃料不完全燃烧的产物.Soot is usually the product of the imperfect combustion of fuel.煤烟通常是燃料不完全燃烧的产物....
Conclusion: Total laminectomy destroyed the stability of lumbar spine.结论: 全椎板切除术极大破坏腰椎稳定性.Methods: Discontinous laminectomy and non - trauma incision of spinal ganglion is the main surgical technology.方法: 致压物摘除、神经根节部的无创减...