1. The region of tissue in a root or stem lying between the epidermis and the vascular tissue. 
   皮层位于表皮组织和导管组织之间的根茎中的组织区
2. The branch of dentistry that deals with diseases of the tooth root, dental pulp, and surrounding tissue. 
   牙髓病学研究牙根、牙髓及其周围组织疾病的牙医学的一个分支
3. The undifferentiated plant tissue from which new cells are formed, as that at the tip of a stem or root. 
   分生组织能形成新细胞的未分化的植物组织，如位于茎或根尖端的
4. In 1997 the FDA approved lasers that remove tooth decay and earlier this year gave the thumbs up to laser treatments for root canals and other hard-tissue procedures. 
   1997年，fda批准激光用以切除牙齿腐烂部分。而今年早些时候，fda又同意将激光用于治疗牙槽和其它硬组织的治疗过程中。
5. membranous milk vetch root 
   黄芪

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• 1. 根组织
  root tips of mature embryos 成熟胚的根尖...root tissue 根组织...root top of onion 洋葱根尖
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