• 1. primary constriction: 主缢痕 | 初级缢痕
• 2. primary y constriction: 主缢痕

• 1.Centromere is the primary constriction on the chromosome, a region at which the sister chromatids are held together.
  着丝点是染色体的主缢痕，在这个地方姐妹染色单体连在一起。
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• 2.Centromere --- The primary constriction on the chromosome, a region at which the sister chromatids are held together and at which the kinetochore is formed.
  染色体的主缢痕，使姐妹染色单体连在一起，在其两侧各有一个由蛋白构成的动粒。
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• 3.Objective To evaluate the effectiveness of external constriction valvuloplasty of superficial femoral vein in the treatment of primary lower extremity deep vein valve insufficiency.
  目的探讨原发性下肢深静脉瓣膜功能不全的手术治疗方法及效果。
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